小型火花点火发动机是轻型轿车和摩托车的主要动力，对它的研究具有重要意义。

Small spark ignition engines are the chief power of cars and motorcycles, the study of which are meaningful.

youdao

小型火花点火发动机是轻型轿车和摩托车的主要动力，对它的研究具有重要意义。

Small spark ignition engines are the chief power of cars and motorcycles, the study of which are meaningful.

youdao