valve timing event

例句：

1. 1. The valve timing in the engineis critical for fuel efficiency.
   发动机中的阀门时序对于燃油效率至关重要。
2. 2. During thevalve timing event, the valve opens andcloses to regulate airflow.
   在阀门时序事件期间，阀门打开和关闭以调节空气流量。
3. 3. Thevalve timing error can leadto engine misfires orperformance issues.
   阀门时序误差可能导致发动机熄火或性能问题。