单词	ratchet wheel
释义	ratchet wheel noun 1. : a notched or toothed wheel either held in position or turned by an engaging detent, pawl, or click 2. : the retaining wheel over the mainspring arbor of a timepiece [ratchet wheel: 1 wheel, 2 reciprocating lever, 3 pawl for communicating motion, 4 pawl for preventing backward motion]
随便看	submotive submountain submucosa submucosal submucous submucous submucous coat submultiple submundane submunition submuscular sub-mycenaean submytilacea insident inside of inside out inside-out flower inside quire insider insider inside right insider trading insides inside straight inside stuff

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