例句：
1、部队已准备发起攻击。
The troops took up offensive positions.
2、部队从沦陷的城市安全撤出。
The troop made good their retreat from the occupied city.
3、部队在小山上集合。
The troops mustered on the hill.
4、部队已经撤出危险地带。
The troops have been withdrawn from the danger area.
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