beat at的用法和樣例：
例句
用作及物動詞 (vt.)
- She is pecking away at the keys of a typewriter.
她不停地敲打著打字機的鍵。 - He knocked at the door and entered.
他敲了敲門便走進去了。
辭彙搭配
- beat someone at his own weapon 以彼之矛攻彼之盾...
- beat someone at his own weapons 以彼之矛攻彼之盾...
- beat someone at his own game 在某人的擅長的活動上...
