They don't hesitate to open fire when confronted by police

　　他們遭遇警察時毫不猶豫地開火。

　　After three hours of playing cat and mouse, they threatened to open fire on our vessel, so we stopped

　　玩了3個小時的貓捉老鼠后，他們威脅說要向我們的船上開火，所以我們就停了下來。

　　Don't leave a child alone in a room with an open fire.

　　房間里有裸露的明火時，不要讓孩子獨(dú)處其中。

　　It is commonplace for snipers to open fire on aid convoys.

　　狙擊手向救援車隊(duì)開火的事情很常見。

　　You not afraid that I open fire in your back?

　　你不怕我在你背后開槍？