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chè zhuǎ shì yī zhǒng fēi cháng jiǎn dān de zhǐ ràng zhuàn zhóu wǎng yī gè fāng xiàng zhuàn dòng de zhuāng zhì
掣爪是一种非常简单的只让转轴往一个方向转动的装置。
Pawl is a simple device which allows a shaft to turn only one way.
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