They fired in long bursts, which depleted their ammunition

　　他們長(cháng)時(shí)間開(kāi)火，耗盡了彈藥。

　　He took careful aim at the target before he fired.

　　開(kāi)火之前他仔細地瞄準了目標。

　　Enemy guns fired a shell every two or three minutes.

　　敵人的大炮每隔兩三分鐘就會(huì )開(kāi)火。

　　He aimed at the target, fired and missed it.

　　他瞄準目標開(kāi)火，卻未打中。

　　But no one fired!

　　但是沒(méi)有人開(kāi)火。