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	protective department protective foods protective liability insurance protectively protectiveness protective resemblance protective system protective tariff protector protector protectoral protectorate protectorian protectory protectress protectrix protects protege protegee protegulum protei proteic proteid proteida proteidae

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