They fired in long bursts, which depleted their ammunition
他们长时间开火，耗尽了弹药。
He took careful aim at the target before he fired.
开火之前他仔细地瞄准了目标。
Enemy guns fired a shell every two or three minutes.
敌人的大炮每隔两三分钟就会开火。
He aimed at the target, fired and missed it.
他瞄准目标开火，却未打中。
But no one fired!
但是没有人开火。