knee-cap

基本解释

Jean Valjean was, in fact, regularly installed; he had his belled knee-cap; henceforth he was official.
冉阿让算是安插妥当了，他有了那副结在膝上的革带和一个铃铛，他从此是有正式职务的人了。
Large-cap stocks led the rally Wednesday as a knee-jerk reaction to the rise of their H-share counterparts.
周三，作为对于H股同类股票上升的正常反应，大盘股主导了这次止跌。
It crystallizes the difference between Apple, which tends to keep prices (and profit margins) high, and Amazon, which likes to start low and drive lower in an effort to knee-cap the competition.
这就是苹果和亚马逊的区别了：苹果倾向于把价格（和利润率）架得很高，而亚马逊，喜欢走低价平民路线，一心想把这场竞争拉低放慢。