短语词组短语Rachet effect 棘轮效应rachet jacks 棘轮千斤顶rachet effects 激励机制设计约束keep up a rachet 方〉∶七嘴八舌地说话Brownian Rachet model 布朗棘轮模型Exalted with Rachet 棘齿崇拜Rachet & Clank 瑞奇与叮当steam boat rachet 花篮螺丝 返回 rachet