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.
由于该机械联接，驻车掣爪保持在非阻挡位置中，并被防止落入驻车齿轮中，即使在复位弹簧破损时。
Due to this mechanical coupling, the park pawl is retained in the unblocked position and prevented from falling into the park gear even if the return spring breaks.
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