gears
n.
齿轮( gear的名词复数 );
装备;
挡;
（做某事的）速度;
例句:
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Making machine gears requires precision tools and considerable expertise.
来自SA
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Peter drove jerkily, cornering too fast and fumbling the gears.
彼得转弯太急，换挡不利索，车开得一颠一颠的。
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He looked up into the mirror as he changed through his gears.
他一边换挡，一边抬眼看后视镜。
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Careless use of the clutch may damage the gears.
离合器使用不慎可能会损坏传动装置。
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Gears connect the motor and sheave in slower systems.
来自SA
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The lack of interest prompted him to shift gears.
来自WSJ