n.

1. 使用，用法；处理，对待[U][（+of）]
   The TV set was damaged from rough usage.

   这架电视机由于使用太不小心而损坏了。

   He is totally ignorant of social usage.

   他对社会习俗一无所知。

2. 习惯，习俗[C][U]
   "Do you have it?" is a common American usage, but it would be more likely for British speakers to say "Have you got?"

   “Do you have it?”是惯用的美语用法，而英国人很可能说“Have you got?”。

3. 【语】惯用法；语法[C][U]
   This is a book on modern English usage.

   这是一本关于现代英语惯用法的书。

n.

1. the action of using something or the fact of being used.
2. habitual or customary practice.
3. the way in which a word or phrase is normally and correctly used.