Exhaust and defecate
排气───exhaust;排便───defecation
My car needs a new exhaust.───我的汽车需要一个新排气管。
The exhaust streamed black smoke.───排气管里冒出黑烟。
After the family eat out for a stroll, the early moon, the stars are all shy to hide among the car exhaust, how charming night ah!───一家人吃饱后出来散步，月光初现，所有的星光都害羞地躲在汽车的尾气之中，多么迷人的夜晚啊！
Air is drawn in at the front by a large fan, and pushed out the back. Exhaust gases are also ejected, at a higher speed.───一个大的鼓风机把空气从前面拉入，从后面推出。尾气高速喷出。
If the valves do not open and close at the right time or at all, air cannot get in and exhaust cannot get out, so the engine cannot run.───如果阀门不在正确的时间打开或关闭，空气就不能进入，废气也不能排除，引擎就无法工作。
When your exhaust falls off,(sentencedict.com) you have to replace it.
Exhaust fumes are poisoning our cities.
The policy aims at cutting down exhaust emissions.
Exhaust fumes are bad for your health.
The tail exhaust pipe of the motor vehicle emitted poisonous smoke.