"This is Brady Coyne," said Sam, jerking his head in my direction.

“这是布雷迪·科因”，萨姆说，他的头朝我这边甩了一下。

Make sure that you execute all movements smoothly and without jerking.

确保你流畅、无颤动地完成所有动作。

I go to give him a kiss—just a peck—and he veers off, jerking his head out of the way like a nervous racehorse.

我走过去要给他一个吻，只是匆匆一吻，而他却转身走开了，像匹紧张的赛马似的把头扭到一边。

"No, " she cried vehemently, jerking away.

没有！“她猛地把头扭开，激怒地大叫了。

Used when jerking motion is needed in mechanical industry.

机械工业中，需要产生冲击运动的场合。