ratchet

名词（防倒转的）棘齿

及物动词安装棘轮于；松脱; 把…造成棘齿形，于…作棘齿，在…上刻锯齿

1. 棘轮：法国物理学家宣称,存在於两电中性表面间的开斯米力(Casimir force)可以用来操作微型棘轮(ratchet),未来或许能应用在微米级机器中. 巴黎第十一大学(Universite Paris-Sud)的Thorsten Emig利用具有特殊皱纹因而间只能朝一个方向滑动的表面,

1. (防倒转的)棘齿，棘轮
    In a tool or machine, a ratchet is a wheel or bar with sloping teeth, which can move only in one direction, because a piece of metal stops the teeth from moving backwards.

    e.g. The chair has a ratchet below it to adjust the height...
           这把椅子下面有棘轮调整高度。
    e.g. A ratchet mechanism transfers the thread from spool to bobbin.
           一种棘齿装置把线从线轴转到梭心上。

2. （使）（工具或机器）发出嗒嗒声
    If a tool or machine ratchets or if you ratchet it, it makes a clicking noise as it operates, because it has a ratchet in it.

    e.g. The rod bent double, the reel shrieked and ratcheted...
           操作杆进一步弯曲，线轴发出刺耳的吱吱声。
    e.g. She took up a sheet and ratcheted it into the typewriter.
           她拿起一张纸，把它哗哗啦啦地塞到打字机中。

3. ratchet是什么意思

3. （形势的）每况愈下，恶化
    If you describe a situation as a ratchet, you mean that it is bad and can only become worse.

    e.g. ...another raising of the ratchet of violence in the conflict.
           冲突中又一次的暴力升级

相关词组：ratchet down ratchet up

1. Some local governments are literally digging holes and then filling them in to ratchet up the GDP.

2. And yes, some parents mistakenly believe that the videos are going to ratchet up their children's IQ.

3. United began to ratchet up the pressure on the Chelsea goal just before the interval.

4. The findings highlight the damage inflicted on Labour by a scandal over lawmakers'perks and may ratchet up speculation over Brown's future.

5. But economists say consumers would need a stronger and more prolonged increase in their wealth to persuade them to ratchet up spending.

6. But Mandelson also would aim to ratchet any duties lower if China and Vietnam later show signs of making changes.

7. Obama plans to lobby the leaders of China and Russia at the Seoul summit to ratchet up pressure on Pyongyang.

8. Against these developments, the debate continues whether China should again ratchet up investment.

9. Within a week, a nationwide campaign was launched to ratchet up efforts to improve product quality and supervision.

noun

verb