学习资料
[意 思]vi. 变化,呈多样化
[例]  That sort of thing varies from person to person.
那种事因人而异。
vt. 使不同,变更,修改
[例]  He never varied his habits. 他从未改变过自己的习惯。
vt. 使多样化
[例]  Teachers should vary their lessons to make them more interesting. 为了增加趣味,教师应该使自己的课多样化。