main throttle valve

例句：

1. 1. The car's engineis running smoothly with the main throttlevalve adjusted correctly.
   汽车发动机运行平稳，节气门调整正确。
2. 2. Main throttle valves are responsible for controlling the flow ofair into the engine.
   主节气门阀负责控制进入发动机的空气流量。
3. 3. During maintenance, the technician replaced the main throttlevalve to ensure optimal performance.
   在维护期间，技术人员更换了主节气门阀以确保最佳性能。