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声音简介
考点归纳:aim at 瞄准,针对
经典例句:A bird is flying in the air空中飞着一只鸟
The big windows are open to air the room宽大的窗户敞开着,使房间通风。
考点归纳:by air通过航空;
in the air在空中,悬而未决,在流传中,不设防
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Yoo1007
We aim to help the poorest families.
Yoo1007 回复 @Yoo1007:
We teenagers should aim at contributing something useful to the society.