举例来说，关于齿轮的小节阐述了啮合比率，以及不同类型的齿轮如何工作。

For example, the section on gears explained gearing ratios and how the different types of gears worked.

youdao

举例来说，关于齿轮的小节阐述了啮合比率，以及不同类型的齿轮如何工作。

For example, the section on gears explained gearing ratios and how the different types of gears worked.

youdao