柯林斯詞典ratchet /?r?t??t/ (ratcheting,ratcheted,ratchets) 1. N-COUNT In a tool or machine, a ratchet is a wheel or bar with sloping teeth, which can move only in one direction, because a piece of metal stops the teeth from moving backward. (防倒轉(zhuǎn)的)棘齒; 棘輪 The chair has a ratchet below it to adjust the height. 這把椅子下麪有一個棘輪來調(diào)整高度。2. V-T/V-I If a tool or machine ratchets or if you ratchet it, it makes a clicking noise as it operates, because it has a ratchet in it. 使(工具或機器)發(fā)出嗒嗒聲; (工具或機器)發(fā)出嗒嗒聲 The rod bent double, the reel shrieked and ratcheted. 該操作桿加倍彎曲，線軸發(fā)出刺耳的嗒嗒聲。 She took up a sheet and ratcheted it into the typewriter. 她拿起一張紙，把它塞入打字機，發(fā)出一陣“嗒嗒”的聲音。 返回 ratchet劍橋詞典a part of a machine that allows movement in one direction only. It is usually a wheel with teeth-like parts that either slide over or lock against the free end of a bar . 棘輪，棘齒 返回 ratchet