例句：

　　1、部隊(duì)已準(zhǔn)備發(fā)起攻擊。

　　The troops took up offensive positions.

　　2、部隊(duì)從淪陷的城市安全撤出。

　　The troop made good their retreat from the occupied city.

　　3、部隊(duì)在小山上集合。

　　The troops mustered on the hill.

　　4、部隊(duì)已經(jīng)撤出危險地帶。

　　The troops have been withdrawn from the danger area.