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。