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pinion /ˈpɪniən/ n

中文：小齿轮

中文 · 小齿轮Español · piñónFrançais · pignon
Meaning：Small toothed wheel downshifting the turning handle’s motion: each turn of the handle translates into at least three rotations of the chuck.
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Found in these illustrated scenes（2）

Weight-driven movement Hand drill

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