valve clearance adjustment

例句：

1. 1. The valve clearance adjustment was critical to the engine's performance.
   阀门间隙调整对发动机的性能至关重要。
2. 2. During maintenance, the technician adjusted the valve clearance to ensure smooth operation.
   在维护期间，技术人员调整了阀门间隙以确保顺畅运行。
3. 3. The valve clearance adjustment is crucial for maintaining proper airflow in the engine.
   阀门间隙调整对于保持发动机中适当的气流至关重要。