ratchetn.棘轮；棘齿v.（使）渐进=rachet.ratchetting latch棘爪锁紧装置ratchet shakedown棘轮安定ratchet mechanism棘轮机构,棘轮传动装置ratchet type jack伞齿轮式起重器ratchet brace bit棘轮摇钻钻头ratcheting device棘轮装置ratchet elbow lock棘轮式肘关节锁ratchetting effect棘轮效应Ratchetting strain棘轮应变ratchet screw jack棘轮螺旋起重器