throttling valve

例句：

1. 1.The throttling valve is used to control the flow of oil in the engine.
   节流阀用于控制发动机中油的流动。
2. 2.The throttling valve was designed to prevent overheating of the engine.
   节流阀被设计成防止发动机过热。
3. 3.The throttling valve is an essential component of the fuel injection system.
   节流阀是燃油喷射系统的一个关键部件。