They fired in long bursts, which depleted their ammunition

　　他們長時間開火，耗盡了彈藥。

　　He took careful aim at the target before he fired.

　　開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開火。

　　He aimed at the target, fired and missed it.

　　他瞄準目標開火，卻未打中。

　　But no one fired!

　　但是沒有人開火。