国人爱食甲鱼和乌龟,并视之为滋补品。近年来,随着生活水平的提高,国人对甲鱼和乌龟的需求量激增,不仅国内的野生甲鱼和王八几遭灭顶之灾,东南亚的甲鱼王八也源源不断流入我国: Every day tons of live turtles and tortoises are being...国人爱食甲鱼和乌龟,并视之为滋补品。近年来,随着生活水平的提高,国人对甲鱼和乌龟的需求量激增,不仅国内的野生甲鱼和王八几遭灭顶之灾,东南亚的甲鱼王八也源源不断流入我国: Every day tons of live turtles and tortoises are being shipped from South and Southeast Asia to China. 估算之下,东南亚每年流入中国的甲鱼和乌龟的数量在一千万只左右! 孟加拉国从事甲鱼和乌龟贸易的人数竟有五万之众,年贸易量在百万只上下,价值达150万美元。 读者朋友,你在读了本文之后,是否觉得应该“嘴”下留情? 文章的末尾提及: Efforts to farm(饲养)the animals should also be intensified with the aim of taking the strain off wild populations. 值得一提的是:近几年,上海市场的甲鱼(人工饲养)价格一跌再跌。500克人工饲养的甲鱼的价格已经从过去的百元左右,下跌至目前的25元上下,且少人问津。】展开更多
I have a pet tortoise named Lucky.He is very lovely.I like him very much.He has a short tail,four short legs,a small head and a hard shell.He enjoys to eat① meat and vegetables,so I often feed him some fish and pork....I have a pet tortoise named Lucky.He is very lovely.I like him very much.He has a short tail,four short legs,a small head and a hard shell.He enjoys to eat① meat and vegetables,so I often feed him some fish and pork.He likes sleeping in the sand.展开更多
利用弯曲时空中标量粒子运动的 Hamilton Jacobin方程,研究带有电荷和磁荷的球对称动态黑洞周围时空中标量粒子的能量分布.得到了发生自发辐射的能量条件,它不仅依赖于黑洞的质量、电荷和磁荷,还与黑洞视界的变化有关,与视界附近的四维...利用弯曲时空中标量粒子运动的 Hamilton Jacobin方程,研究带有电荷和磁荷的球对称动态黑洞周围时空中标量粒子的能量分布.得到了发生自发辐射的能量条件,它不仅依赖于黑洞的质量、电荷和磁荷,还与黑洞视界的变化有关,与视界附近的四维电磁势有关.展开更多
根据时空对称性,确定了整体单极Anti de Sitter(AdS)黑洞的事件视界和宇宙视界的位置,利用Damour Ruffini方法研究了AdS黑洞的温度,给出了Klein Gordon方程在视界附近的渐近解.通过引入Edding ton Finkelstein坐标,解波动方程所获得的热...根据时空对称性,确定了整体单极Anti de Sitter(AdS)黑洞的事件视界和宇宙视界的位置,利用Damour Ruffini方法研究了AdS黑洞的温度,给出了Klein Gordon方程在视界附近的渐近解.通过引入Edding ton Finkelstein坐标,解波动方程所获得的热谱,证实了AdS黑洞具有Hawking辐射.展开更多
文摘国人爱食甲鱼和乌龟,并视之为滋补品。近年来,随着生活水平的提高,国人对甲鱼和乌龟的需求量激增,不仅国内的野生甲鱼和王八几遭灭顶之灾,东南亚的甲鱼王八也源源不断流入我国: Every day tons of live turtles and tortoises are being shipped from South and Southeast Asia to China. 估算之下,东南亚每年流入中国的甲鱼和乌龟的数量在一千万只左右! 孟加拉国从事甲鱼和乌龟贸易的人数竟有五万之众,年贸易量在百万只上下,价值达150万美元。 读者朋友,你在读了本文之后,是否觉得应该“嘴”下留情? 文章的末尾提及: Efforts to farm(饲养)the animals should also be intensified with the aim of taking the strain off wild populations. 值得一提的是:近几年,上海市场的甲鱼(人工饲养)价格一跌再跌。500克人工饲养的甲鱼的价格已经从过去的百元左右,下跌至目前的25元上下,且少人问津。】
文摘I have a pet tortoise named Lucky.He is very lovely.I like him very much.He has a short tail,four short legs,a small head and a hard shell.He enjoys to eat① meat and vegetables,so I often feed him some fish and pork.He likes sleeping in the sand.
文摘根据时空对称性,确定了整体单极Anti de Sitter(AdS)黑洞的事件视界和宇宙视界的位置,利用Damour Ruffini方法研究了AdS黑洞的温度,给出了Klein Gordon方程在视界附近的渐近解.通过引入Edding ton Finkelstein坐标,解波动方程所获得的热谱,证实了AdS黑洞具有Hawking辐射.
