一个齿轮的齿与另一齿轮的齿相啮合。

The teeth in one wheel engage with those of another.

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转动时齿轮上的齿与齿相啮合。

The teeth on the gears mesh as they turn round.

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螺纹杆与齿轮相啮合；改变轴旋转运动的方向。

The spirally threaded shaft of a worm gear.

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螺纹杆与齿轮相啮合；改变轴旋转运动的方向。

The spirally threaded shaft of a worm gear.

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