One sunny morning,students are in a classroom Jake shows his smart watch,"It tells time,the heart rate,and the weather!""It's easy to know the time now,"Ms.Lee walks in,with a smile on her face...One sunny morning,students are in a classroom Jake shows his smart watch,"It tells time,the heart rate,and the weather!""It's easy to know the time now,"Ms.Lee walks in,with a smile on her face."But how did people know the time in ancient times?"展开更多
文摘One sunny morning,students are in a classroom Jake shows his smart watch,"It tells time,the heart rate,and the weather!""It's easy to know the time now,"Ms.Lee walks in,with a smile on her face."But how did people know the time in ancient times?"
