ratchet

n 1 device consisting of a toothed wheel or bar with a catch that fits between the teeth allowing movement in one direction only 棘轮机构. 2 (also `ratchet-wheel) wheel that forms part of this device 棘轮. =>illus 见插图.

rarely, rareness, raring, rarity, rascal, rascally, rase, rash, rasher, rashly, rashness, rasp, raspberry, raspy, Rastafarian, rat, rat-a-tat-tat, rat-tat, ratatat, ratbag, rate, rate-capping, rateable, ratepayer, ratfink, rather, rather than, rather too, ratification, ratify, rating, ratio, ratiocination, ration, rational, rationale, rationalism, rationalist, rationalistic, rationality,