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1. At

be good at 精通于

be annoyed at 对……烦恼

be angry at 对 (事) ……发怒

(take) aim at 瞄准

laugh at 因……而发笑

stare at 盯着看，凝视

at the best 充其量

at first 开始

at large 自由地

at least 至少，起码

at length 最后，终于

at once 立即，马上

at present 现在

at rest 休息，静止不动

at times 间或，有时

He was angry at his brother's remark.

他对他兄弟的批评很恼火。

I don't know him but he has been staring at me for ten minutes.

我不认识他，但是他盯了我足有十分钟。

The foreign countries' attempt at a blockade of the port was unsuccessful.

外国试图对这个港口实施封锁，但没有成功。

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