spark frequency

例句：

1. 1. The new engine has a higher spark frequency than the old one.
   新引擎的火花频率比旧的要高。
2. 2.Engineers need to measure the spark frequency to optimize performance.
   工程师需要测量火花频率以优化性能。
3. 3. During testing, we observed that the spark frequency varied with the load.
   在测试期间，我们观察到火花频率随负载而变化。