Behind their cells was an unguarded corridor that led to a vent on the roof.
在他们的牢房后面有一个无人看守的走廊，走廊的尽头有一个通往房顶的通风口。
On the roof, overlooking the activity, Michael crouches behind an exhaust vent to stay hidden from the helicopter.
在屋顶上，Michael俯视着他们的行动，一架直升机飞过，他蹲伏在一个排气口处以免被发现。
All these come with a space heater that is tucked behind a retro style vent.
所有这些需要用安装在一个复古风格通风器前的一个空间加热器来完成。
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