期刊文献+
共找到2,242篇文章
< 1 2 113 >
每页显示 20 50 100
贵州省2011-2022年新报告青年学生HIV/AIDS患者特征及趋势分析 被引量:1
1
作者 袁智 曹文杰 +3 位作者 范家诚 韦薇 姚永明 郑敏 《中国艾滋病性病》 北大核心 2025年第5期515-520,共6页
目的了解2011-2022年贵州省新报告青年学生HIV/AIDS患者流行特征,为针对该人群制定防控策略提供科学依据。方法通过“中国疾病预防控制信息系统艾滋病防治基本信息系统”,对2011-2022年贵州省新报告的全部15~24岁青年学生HIV/AIDS患者... 目的了解2011-2022年贵州省新报告青年学生HIV/AIDS患者流行特征,为针对该人群制定防控策略提供科学依据。方法通过“中国疾病预防控制信息系统艾滋病防治基本信息系统”,对2011-2022年贵州省新报告的全部15~24岁青年学生HIV/AIDS患者进行分析,包括地区、性别、年龄和时间分布,采用Joinpoint回归模型进行新发现率的趋势变化分析。结果2011-2022年贵州省新报告15~24岁青年学生患者1122例,年报告病例数从2011年的52例上升至2022年的107例,占当年15~24岁HIV/AIDS总数的比例呈总体上升趋势(χ^(2)_(趋势)=62.771,P<0.001),年新发现率从2011年的2.96/10万上升到2022年的4.45/10万。15~17岁组新发现率呈上升趋势(2011-2022年APC=9.03);18~22岁组呈先上升后下降的趋势(2011-2015年APC=9.59,2015-2022年APC=-5.73);23~24岁组新发现率先保持平稳后快速下降(2011-2017年APC=-1.11,2017-2022年APC=33.36);总体看2011-2017年青年学生HIV/AIDS患者新发现率呈上升趋势(APC=11.00),2017-2022年保持平稳(P≥0.05)。不同性别青年学生HIV/AIDS患者年龄、民族、受教育程度、病例发现途径、感染途径差异有统计学意义(P<0.001);通过医疗机构发现青年学生患者的比例呈逐年上升趋势(χ^(2)_(趋势)=15.706,P<0.001)。结论2011-2022年,贵州省新报告15~24岁青年学生HIV/AIDS患者数总体呈现先上升后平稳的趋势,但15~17岁组新发现率呈上升趋势;男性以同性传播为主,女性以非婚非商业性行为为主,应将宣传教育关口前移,针对性地开展干预和检测工作。 展开更多
关键词 艾滋病病毒感染者/艾滋病患者 青年学生 特征
原文传递
Chinese college student aid policy:A case study of H University
2
作者 XU Guoxing 《Frontiers of Education in China》 2008年第4期585-593,共9页
The research findings have made it clear that Chinese college student aid policy has several characteristics.Generally speaking,student financial aid is increasing up to some extent.The government financial aids focus... The research findings have made it clear that Chinese college student aid policy has several characteristics.Generally speaking,student financial aid is increasing up to some extent.The government financial aids focus mostly on improving equality of educational opportunity in higher education.However,aids from the government are inadequate,especially national student loans.Besides,all kinds of aids were decreasing from 2004 to 2006 and the aid programs were short of stability between various years.In order to improve equal access to higher education through student aid policy,it is necessary to enlarge the government aids and reform the aid system. 展开更多
关键词 college student aids financial aid policy the level of financial aids
原文传递
A Survey on the Current Situation of Prehospital First Aid about Knowledge, Belief and Behavior among University Students in Jingzhou 被引量:1
3
作者 Tianyue Zhang Hong Zhou +1 位作者 Chenyang Xu Juan Zhou 《Open Journal of Applied Sciences》 2024年第5期1251-1261,共11页
Objective: To understand the current situation of prehospital first aid knowledge, attitude and behavior of university students in Jingzhou City. Methods: A prehospital first aid knowledge questionnaire and the conven... Objective: To understand the current situation of prehospital first aid knowledge, attitude and behavior of university students in Jingzhou City. Methods: A prehospital first aid knowledge questionnaire and the convenience sampling method were used to survey 307 university students in Jingzhou City. Results: The mean score of prehospital first aid knowledge of university students in Jingzhou City was 12.85 ± 2.643, the mean score of attitude was 50.73 ± 4.114, and the mean score of behavior was 39.05 ± 8.898;There was a statistically significant difference in the scores of prehospital first aid knowledge, attitude, and behavior of university students depending on whether or not they had received prehospital first aid training (P P Conclusion: Jingzhou University students have a positive attitude toward pre-hospital first aid, but the knowledge level and behavior are low, which suggests that the government, society and the school should create good conditions to promote the improvement of pre-hospital first aid knowledge and ability. 展开更多
关键词 Prehospital First aid University student KNOWLEDGE ATTITUDE BEHAVIORS
在线阅读 下载PDF
First Aid Knowledge and Attitude of Secondary School Students in Saudi Arabia
4
作者 Ali S. Mobarak Raouf M. Afifi Amani Qulali 《Health》 2015年第10期1366-1378,共13页
Background: Increasing the number of qualified people, including school students who can play a significant role in first-aid (FA) and basic life support (BLS) arena is a public health demand. Aim: To assess the aware... Background: Increasing the number of qualified people, including school students who can play a significant role in first-aid (FA) and basic life support (BLS) arena is a public health demand. Aim: To assess the awareness of Saudi secondary school students regarding FA and BLS. Methodology: 360 male secondary school children in Taif, Saudi Arabia were surveyed. Results: The mean students’ age was 17.4 ± 1.21 years. The mean participants’ FA knowledge score was 64.8% ± 11%. Generally, trained students reported both better FA knowledge and skills than untrained counter-parts;for 79.6% trained-compared to 53.7% untrained-students recorded such score > 70% [χ2 (df 1) = 11.60, p 70%) [62.3% 2(df 1) = 5.90, p = 0.02] was. Trained students better deal with critical cases, bleeding and bodily injury compared to untrained peers [89.8% vs. 55.9%, χ2 (df 1) = 20.3, p 2 (df 1) = 11.62, p = 0.04;81.6% vs. 67.2%, χ2 (df 1) = 4.13, p = 0.04, respectively]. Only 37.2% of schools had FA incorporated in the education curriculum. Eventually, FA training and the presence of FA group were significant predictors for improved FA knowledge among students [odds ratio (OR) 3.35, 95% CI 1.60 - 7.06;OR 2.28, 95% CI 1.34 - 3.95, respectively). Conclusions: First-aid training is crucial to enhance school children’s FA skills and to thrust their contribution to health emergency control efforts. Incorporating FA training within the educational curriculum of Saudi schools is a step forward to disseminate FA message in the community. 展开更多
关键词 First aid Secondary-School studentS SAUDI ARABIA
暂未订购
Knowledge, Attitudes and Beliefs on HIV/AIDS Among Tertiary Students in Papua New Guinea
5
作者 Orathinkal Jose Keri Totona +3 位作者 Alphonse Begani Tuka Andew Bob Tombe Rose Begani 《World Journal of AIDS》 2011年第2期50-61,共12页
This cross-sectional study among 1597 tertiary level students, 757 (48%) males and 832 (52%) females (9 respondents no mention of gender), from 12 institutions, across Papua New Guinea, examined their level of knowled... This cross-sectional study among 1597 tertiary level students, 757 (48%) males and 832 (52%) females (9 respondents no mention of gender), from 12 institutions, across Papua New Guinea, examined their level of knowledge, attitudes and beliefs about HIV/AIDS. The study revealed that the majority of the students have a very good knowledge of HIV/AIDS;in general students have a considerate and compassionate attitude towards those infected with HIV/AIDS;and the students have positive and healthy attitudes and beliefs regarding HIV/AIDS. Among the demographic variables of gender, province and the institution of their study a significant difference showed in their levels of knowledge and also a statistically significant association was found between beliefs and knowledge. Interestingly, about 58% of the students think that HIV/AIDS is a punishment from God. Almost half (46.5%) of the respondents think that learning about sex and the use of condoms could also encourage young people to engage in more frequent sex. Although, in general the students have a very good knowledge, they indicate the need for more sex education and awareness pro-grams about HIV/AIDS that could be given in high schools. 展开更多
关键词 HIV/aidS SEX Education TERTIARY studentS
暂未订购
An effective Australian-Chinese peer education program on HIV/AIDS/STDs for university students in China
6
作者 高源 施榕 +3 位作者 吕姿之 仇玉兰 钮文异 Short RV 《生殖医学杂志》 CAS 2002年第z1期7-12,共6页
  IntroductionCurrently, there are at least 850,000 people living with human immuno-deficiency virus (HIV) and acquired immuno-deficiency syndrome (AIDS) in China. Among them 16-29 years old account for about 65%. A...   IntroductionCurrently, there are at least 850,000 people living with human immuno-deficiency virus (HIV) and acquired immuno-deficiency syndrome (AIDS) in China. Among them 16-29 years old account for about 65%. According to the Chinese health authorities, if the preventive measures are not effective, the figure could reach as many as 10 million by the year 2010[1]. Since there are currently no cure or vaccines for HIV/AIDS, changing people's high-risk behaviors is the main approach that is taken to slow down the epidemic. This can be done through effective HIV/AIDS education, especially for young people. In 1997, a 4-year adolescent HIV/AIDS peer education program was introduced to in Beijing and Shanghai, which was based on a successful Australian model developed by Professor Roger Short, in which senior medical students were trained and used as peer educators to teach their junior peers about HIV/AIDS[2].…… 展开更多
关键词 aidS STD HIV An effective Australian-Chinese peer education program on HIV/aidS/STDs for university students in China
暂未订购
A Graduate Student and Children Orphaned by AIDS
7
作者 BIAN CHENG 《The Journal of Human Rights》 2004年第4期24-25,共2页
At 26, Li Dan could have a promising career as an astronomy major at Beijing Normal University for undergraduate studies and a solar physics major at the National Astronomical Observatory under the Chinese Academy of ... At 26, Li Dan could have a promising career as an astronomy major at Beijing Normal University for undergraduate studies and a solar physics major at the National Astronomical Observatory under the Chinese Academy of Sciences for graduate studies. Few people would anticipate that the young man with such a strong science background would give up science to devote himself completely to children orphaned by AIDS. 展开更多
关键词 A Graduate student and Children Orphaned by aidS
原文传递
Assessment of the Level of Knowledge, Attitude, and Practice with Regard to Care of People Living with HIV/AIDS among Nursing and Midwifery Students in Fako, Cameroon
8
作者 Delphine Mbong Wam Iwoi Peter Fon Nde +4 位作者 Euphrasia Yuh Emmanuel Tebit Kwenti Edouard Katayi Tshimwanga Denis Tange Achiri Kenne Emmanuel Djunda 《World Journal of AIDS》 2017年第1期1-15,共15页
Due to the chronic shortage of health personnel, nurses and midwives now play a fundamental role in the care and treatment of people living with HIV/ AIDS (PLHIV) in Cameroon. This study was therefore designed to asse... Due to the chronic shortage of health personnel, nurses and midwives now play a fundamental role in the care and treatment of people living with HIV/ AIDS (PLHIV) in Cameroon. This study was therefore designed to assess the level of knowledge, attitude and practice with regard to care of PLHIV among nursing and midwifery students in Fako division of Cameroon. A survey was performed between May and July 2015, among 227 nursing and midwifery students (in their second to final year of study), selected from 8 government accredited training institutions in Fako division of Cameroon. An anonymous self-administered semi-structured questionnaire was used to collect data. The Pearson’s chi-square test, univariate and multivariate logistic regression analyses adjusting for possible confounders were all performed as part of the statistical analyses. The cutoff of statistical significance was set at p ≤ 0.05. Nursing and midwifery students had a moderate level of HIV/AIDS knowledge (average score of 7.02 on a scale of 11). Attitude towards PLHIV was generally positive (68.7%) but there were some misconceptions and prejudice about PLHIV, with considerable stigmatization (31.3%), unwillingness to share a room with someone infected with HIV (27.7%), and unwillingness to work on PLHIV (23.8%). Good HIV/AIDS knowledge was observed to be the sole independent predictor (p = 0.004) of positive attitude towards PLHIV. Fur-thermore the confidence of the respondents regarding care of PLHIV was generally moderate. Our results suggest the need for the development of a more appropriate education program in nursing and midwifery institutions in Fako division to reduce the discrepancies between the general knowledge, attitude and practice regarding care of PLHIV. 展开更多
关键词 KNOWLEDGE ATTITUDE PRACTICE People Living with HIV/aidS NURSING MIDWIFERY studentS Fako Division Cameroon
暂未订购
HIV/AIDS-Related Knowledge among Secondary School Students in Bangladesh: A Cross-Sectional Study
9
作者 Md. Nazmul Huda Dr. Asm Amanullah 《Advances in Infectious Diseases》 2013年第4期274-280,共7页
Background and Aim of the Study: HIV/AIDS is best viewed as a major epidemic which poses serious challenges to mankind on a global scale. The aim of this study was to assess the HIV/AIDS-related knowledge among second... Background and Aim of the Study: HIV/AIDS is best viewed as a major epidemic which poses serious challenges to mankind on a global scale. The aim of this study was to assess the HIV/AIDS-related knowledge among secondary school students in Bangladesh and investigate the association between secondary school students’ socio-demographic characteristics and their level of knowledge about HIV/AIDS. Methods: Following multistage random sampling technique, a total of 384 students aged 11-17 years were sampled from eight secondary schools and interviewed through a predesigned semi-structured questionnaire. Data analysis was done at three stages including descriptive statistics, bivariate analyses, and multivariate logistic regression. Results: The findings of the study revealed that more than half (55.26%) of the students were above 14 years of age and their ages ranged from 11 to 17 years. This study also found that around three-fourths of the students (75.78%) watched television. With regard to knowledge, this study demonstrated that around two-fifths of the students (36.98%) had very good knowledge about HIV/AIDS and their main sources of HIV/AIDS information were television, newspaper, radio, textbooks, and teachers. The bivariate results of the study indicated that students’ age, gender, type of school, household income, fathers’ and mothers’ literacy, and watching television were significantly associated with level of knowledge about HIV/AIDS. In addition, students’ age, mothers’ literacy, and watching television were found as the significant predictors of knowledge about HIV/AIDS. Watching television was documented as the best single predictor. Conclusion: The results of the study strengthen the assumption that there is an influence of students’ socio-demographic characteristics upon their knowledge about HIV/ AIDS. Moreover, this study suggests that more information on HIV/AIDS should be included in the textbooks of secondary school students in Bangladesh to enhance their knowledge about the taboo subject. 展开更多
关键词 HIV/aidS Knowledge SECONDARY SCHOOL studentS SOCIO-DEMOGRAPHIC Factors
暂未订购
Internet-aided Translation for College Students
10
作者 LIU Hai-na 《海外英语》 2010年第4X期87-91,共5页
The internet,a global network of computers,has brought about radical changes in the way people all around the world are working and communication.It is also significantly affecting the world of translation today,not o... The internet,a global network of computers,has brought about radical changes in the way people all around the world are working and communication.It is also significantly affecting the world of translation today,not only in the way our student handle the words orders but also in how they search for specific linguistic and encyclopedic information.Exploitation of the potentialities of Internet as an electric translation tool offers a numbers of advantages in helping our college students getting ready for their future translation-concerned roles and jobs.This paper describes not only the translation development under the information age background but also the updating and remarkable characteristics of our college translation education.The point of view that translation is also a matter of technology in the time of global information brings about the new subject of the relation between translation and internet as well as a more important role of internet-aided electric tools in translation education. 展开更多
关键词 TRANSLATION electric TOOLS internet-aided TRANSLATION COLLEGE studentS
在线阅读 下载PDF
An Investigation into HIV Risk Behaviors among University Students in Local Colleges and Suggested Interventions
11
作者 Na Peng Xiaozhong Xu 《Open Journal of Applied Sciences》 2025年第1期33-41,共9页
This study investigates the prevalence of HIV high-risk behaviors among university students in S City, Sichuan Province. Using a sampling survey method, a total of 3262 valid questionnaires were collected. Data analys... This study investigates the prevalence of HIV high-risk behaviors among university students in S City, Sichuan Province. Using a sampling survey method, a total of 3262 valid questionnaires were collected. Data analysis revealed ten significant issues related to HIV risk behaviors among university students, leading to suggested intervention strategies to address these behaviors. 展开更多
关键词 University students HIV Risk Behaviors aidS Prevention and Control
在线阅读 下载PDF
中职家庭经济困难学生资助政策执行困境与纾解路径
12
作者 邱小健 李攀 邱恬 《职业技术》 2026年第3期66-72,共7页
基于史密斯政策执行模型,从政策本身、执行机构、目标群体及执行环境等四个层面出发,探析目前我国中职家庭经济困难学生资助政策的执行现状。研究发现:在政策本身方面,有些政策的延续性、明确性及可操作性影响政策的有效执行;在执行机... 基于史密斯政策执行模型,从政策本身、执行机构、目标群体及执行环境等四个层面出发,探析目前我国中职家庭经济困难学生资助政策的执行现状。研究发现:在政策本身方面,有些政策的延续性、明确性及可操作性影响政策的有效执行;在执行机构方面,学校资助管理职能不明确影响政策执行效率;在目标群体方面,学生和家长对政策认知度不高影响政策执行效能;在执行环境方面,偏见弱化了政策执行基础。为达到理想的政策执行效果,应进一步完善资助政策内容体系,加强执行机构管理能力建设,科学准确传达政策目标,优化社会文化生态环境。 展开更多
关键词 中职教育 家庭经济困难学生 资助政策 史密斯政策执行模型
在线阅读 下载PDF
2002-2012年广州市学生HIV/AIDS流行情况 被引量:28
13
作者 樊莉蕊 步犁 +1 位作者 秦发举 徐慧芳 《中国艾滋病性病》 CAS 北大核心 2015年第3期194-196,199,共4页
目的了解广州市学生的艾滋病病毒(HIV)流行特征,为开展对该人群的艾滋病(AIDS)防控工作提供科学依据。方法回顾性分析广州市2002-2012年学生的HIV流行特征。结果 2002-2012年,共报告117例学生HIV感染者/AIDS病例,占广州市总病例的比例从... 目的了解广州市学生的艾滋病病毒(HIV)流行特征,为开展对该人群的艾滋病(AIDS)防控工作提供科学依据。方法回顾性分析广州市2002-2012年学生的HIV流行特征。结果 2002-2012年,共报告117例学生HIV感染者/AIDS病例,占广州市总病例的比例从2008年的0.5%上升至2012年的2.5%。平均年龄(22.1±2.9)岁,最小14岁;男性占96.6%;大专及以上占79.5%;病例至少来自47所大中专院校。性传播感染占95.7%(112/117),同性性传播占72.6%(85/117);2009-2012年,学生病例中的同性性传播的比例逐年增加(χ2=6.70,P=0.035),2008-2012年,总体疫情中同性性传播的比例逐年增加(χ2=209.07,P=0.000);2008-2012年,学生中HIV感染者/AIDS病例同性性传播的比例高于广州市同期总体疫情中同性性传播的比例,差异有统计学意义(χ2=136.05,P=0.000)。病例通过自愿咨询检测发现的占32.5%,专题调查占25.6%。2008-2012年,学生人群中AIDS病例发现的时间较总体人群早(χ2=9.07,P=0.003),CD+4T淋巴细胞数>200个/μL占92.3%。结论HIV对学生的影响已逐渐显现,应及早采取针对性的措施降低AIDS对该人群的危害。 展开更多
关键词 学生 艾滋病 流行特征
原文传递
医学生AIDS知识调查和分析——艾滋病及健康教育的知识态度行为调查 被引量:5
14
作者 王建洲 郭怀兰 +1 位作者 唐念东 刘长俊 《现代预防医学》 CAS 2004年第4期616-617,622,共3页
目的 :了解山区在校 1~ 4年级大学生对 AIDS知识的知晓程度。方法 :对 1~ 4年级大学生 ,采取 KABP问卷调查。结果 :年级越低 ,AIDS知识也越少 ,其态度也较为模糊 ,男女同学之间的知识几无差别 ;家庭教育在 AIDS知识方面有待加强。结... 目的 :了解山区在校 1~ 4年级大学生对 AIDS知识的知晓程度。方法 :对 1~ 4年级大学生 ,采取 KABP问卷调查。结果 :年级越低 ,AIDS知识也越少 ,其态度也较为模糊 ,男女同学之间的知识几无差别 ;家庭教育在 AIDS知识方面有待加强。结论 :山区大学生的 AIDS的知识与国内其它地区几无差别。健康教育应与时俱进 ,学校、社会的各行各业必须加大 AIDS知识教育的力度。 展开更多
关键词 医学生 aidS 知识 调查 艾滋病 健康教育 态度 行为
暂未订购
医学生AIDS知识、态度的调查分析 被引量:4
15
作者 许洁 黄厚今 +2 位作者 李研 邵正旭 俞捷 《现代预防医学》 CAS 北大核心 2008年第15期2927-2928,2930,共3页
[目的]调查分析合肥医学院大学生AIDS相关知识的掌握情况。[方法]以横断面研究方式,对我校7个专业的866名医学生进行匿名式问卷调查。[结果]大众媒体和学校是我校医学生获取AIDS知识的主要来源;8.84%非临床医学专业大学生对HIV感染者患... [目的]调查分析合肥医学院大学生AIDS相关知识的掌握情况。[方法]以横断面研究方式,对我校7个专业的866名医学生进行匿名式问卷调查。[结果]大众媒体和学校是我校医学生获取AIDS知识的主要来源;8.84%非临床医学专业大学生对HIV感染者患者存在歧视态度;临床医学专业学生掌握知识情况比非临床医学专业学生好(P﹤0.05);男生掌握知识情况比女生好(P﹤0.05)。[结论]对医学生特别是非临床医学专业学生加强艾滋病知识教育非常重要,尤其要培养女大学生的自我保护意识。 展开更多
关键词 大学生 艾滋病 调查
暂未订购
湖南省大学生AIDS知识态度行为调查分析 被引量:34
16
作者 张劲松 谢仁桃 《中国艾滋病性病》 CAS 2004年第2期102-103,共2页
目的 为高校开展艾滋病 (AIDS)健康教育提供依据。方法 采取整群随机抽样方法 ,对湖南省 7所高校 5 0 0名大学生进行问卷调查。结果 大学生对AIDS知识比较贫乏 ,对AIDS的相关态度认识不足 ,对待婚前性行为认同或无所谓者高达 4 9.7%... 目的 为高校开展艾滋病 (AIDS)健康教育提供依据。方法 采取整群随机抽样方法 ,对湖南省 7所高校 5 0 0名大学生进行问卷调查。结果 大学生对AIDS知识比较贫乏 ,对AIDS的相关态度认识不足 ,对待婚前性行为认同或无所谓者高达 4 9.7%。结论 当前在大学生中开展全面系统的AIDS健康教育十分必要。 展开更多
关键词 湖南 大学生 aidS 知识 态度 行为 调查 健康教育 艾滋病
暂未订购
某中学学生AIDS知识 态度 行为调查 被引量:39
17
作者 张晓宇 王学良 王建军 《中国艾滋病性病》 CAS 2005年第2期113-115,共3页
目的 了解中学生对艾滋病(AIDS)知识的掌握程度,探讨针对中学生的有效的AIDS健康教育方式。方法 采用不记名问卷方式,对甘肃省一所石油企业中学的所有在校学生进行调查。结果 共发问卷897份,收回有效问卷892份,有效回收率为99 .44%... 目的 了解中学生对艾滋病(AIDS)知识的掌握程度,探讨针对中学生的有效的AIDS健康教育方式。方法 采用不记名问卷方式,对甘肃省一所石油企业中学的所有在校学生进行调查。结果 共发问卷897份,收回有效问卷892份,有效回收率为99 .44%。中学生AIDS基本知识回答正确率平均为7 7%~6 9. 5 %,高中生回答正确率普遍高于初中生;对AIDS传播途径与非传播途径知识的了解随年级的升高而增高,各年级学生对传播途径认知的平均得分非常显著地高于非传播途径;对AIDS病人或艾滋病病毒感染者的态度得分总体偏低,表明学生们对AIDS存在歧视或恐惧认识。有一部分学生存在不良生活习惯,1 7 .5 %的被调查学生有吸烟史,0 .9%的学生回答吸过毒,2 . 8%的学生回答有性生活史,且分别有4 8 .7%、6 5 . 6 %的学生对婚外、婚前性行为持赞成和可以理解的态度。90 %以上被调查学生认为有必要进行AIDS健康教育及自己有必要了解AIDS相关知识;学生主要是通过电视广播、报刊杂志及宣传资料获取AIDS相关知识的。结论 应加强对中学生的AIDS健康教育。 展开更多
关键词 中学生 艾滋病 知识 态度 行为
暂未订购
上一页 1 2 113 下一页 到第
使用帮助 返回顶部