every与each的区别：
The teacher gave a toy to each child.
Each ball has a different colour.
当我们说each child, each student或each teacher时，我们想到的是一个人的情况。而当我们说every child和every student时，我们想到的是全体的情况，every的意思与all接近，表示他们都如此。
Every student loves the English teacher. = All students love the English teacher.
Every child likes playing. = All children like playing.
