at [æt, ət] 介词
1. at (in location of):
2. at (attending):
3. at (expressing point of time):
4. at (denoting amount, degree of):
5. at (in state, condition of):
6. at + 最高级:
7. at after 形:
8. at after 动词:
9. at after 名词:
10. at (in response to):
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