Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

A . a few 一些. a lot 常，很多；许多. a lot of 很多. act... out 把.....表演出来. all right 好，行，可以. anything else 别的事情. at home 在家里. at sc ...