如果敌人开火，就卧倒。
战士卧倒埋伏了起来，守候开火的信号。
The soldiers lay in ambush, waiting for the signal to open fire.
士兵们听到机枪开火时，马上卧倒隐蔽。
The soldiers hit the dirt the moment they heard the machine gun fire.
士兵们听到机枪开火时，马上卧倒隐蔽。
The soldiers hit the dirt the moment they heard the machine gun fire.
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