spark adjustment

例句：

1. 1. The spark adjustment is crucial for the engine's performance.
   火花调整对于发动机的性能至关重要。
2. 2. During the spark adjustment process, the spark plug should be checked and cleaned regularly.
   在火花调整过程中，应定期检查和清洁火花塞。
3. 3.The engineer carefully adjusted the spark timing to optimize the engine's efficiency.
   工程师仔细调整了火花时间，以优化发动机的效率。