valve gear housing

例句：

1. 1. The valve is responsible for controlling the flow of gases in the engine.
   阀门负责控制发动机内气体的流动。
2. 2.The gear housing contains all the gears necessary for the machine to operate.
   齿轮箱外壳包含机器运行所需的所有齿轮。
3. 3.The valve gear housing is designed to withstand high pressure and temperature.
   阀门齿轮箱外壳设计用于承受高压和高温。