短语词组短語Rachet effect 棘輪傚應rachet jacks 棘輪千斤頂rachet effects 激勵機制設計約束keep up a rachet 方〉∶七嘴八舌地說話Brownian Rachet model 佈朗棘輪模型Exalted with Rachet 棘齒崇拜Rachet & Clank 瑞奇與叮儅steam boat rachet 花籃螺絲 返回 rachet