safety exhaust

• 安全排气阀

safety exhaust的用法和样例：

例句

1. Lock the exhaust valve in its open position.
   把排气阀固定在它开启的位置。
2. When the piston nears the top of this stroke, the inlet valve is opened and the exhaust valve closed.
   随着曲轴转动，复又向上带动活塞，同时废气经由气缸头盖上的排气阀排出。