ratchet
核心词议：

速记方法
速记技巧 词源记忆法 来自法语rochet，线轴，纺锤，词源同rock，rocket.引申词义棘轮。插入字母t，比较bake，batch.

知识扩展
短语动词 短语动词 ratchet down （使）有一定减少（或降低） ratchet up （使）有一定上升（或提高） 查看更多 以下资源来自牛津词典 ratchet (sth)↔up （使）逐渐小幅增长 to increase, or make sth increase, repeatedly and by small amounts Overuse of credit cards has ratcheted up consumer debt to unacceptable levels. 滥用信用卡使消费债务逐渐增加到了难以接受的地步。 收起

中文词源： ratchet 防止倒转的棘轮 来自法语 rochet,线轴，纺锤，词源同 rock,rocket.引申词义棘轮。插入字母 t,比较 bake,batch. ratchet
精选例句

常见考点例句：

They have been driven by a ratchet effect .

它们是棘轮效应驱动下的产物。

The colonel is caught in a ratchet and it is tightening .

如今卡扎菲被陷在棘齿之中，而棘齿有收紧之势。

This creates a ratchet effect .

正是这种情况导致了棘轮效应。

Games a and b must be set up to copy a ratchet , which means they must have some direct interaction .

游戏a和游戏b必须设计成模仿棘轮的方式，这意味着它们必须有直接的交互作用。

Dr akeson , meanwhile , created a clever ratchet arrangement by attaching a polymerase enzyme to the ahl protein .

同时埃克森博士通过在ahl蛋白质上附着聚合酶，来创造了一种巧妙的棘轮排布。