Most cars have four forward gears.

大多数汽车有四个前进挡。

youdao

A new type of gears generated with sine-curved rack are put forward.

提出一种以正弦曲线为生成齿条的齿廓曲线生成的新型齿轮。

youdao

A new type of gears generated with sine-curved rack are put forward.

提出一种以正弦曲线为生成齿条的齿廓曲线生成的新型齿轮。

youdao