活塞的上行通过排气门将废气排出汽缸外。
As the piston travels upward, it pushes the spent gases out through the open exhaust valve.
某些汽油中含铅，铅随汽车废气排出，会损伤儿童的大脑。
The lead comes out in car exhaust fumes and it can cause brain damage in children.
一种特制的罩可以将空气导入大楼，也可以将废气排出大楼。
Specially developed cowls direct air into the building, and also draw used air out.
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