ratchetn.棘轮；棘齿v.（使）渐进=rachet.ratchet chain棘轮链系ratchet teeth棘轮齿ratchet lever棘轮柄ratchet tooth棘轮齿ratchetdrivern.棘轮传动装置ratchet hoist扳链手扳葫芦,环链手扳葫芦ratchet brake棘轮制动器ratchet shaft棘轮轴ratchet effect棘轮ratchet motion棘瓜装置