How the word made the leap from "someone who makes you want to cuddle" to "someone who makes you cringe" isn't really known but there are a few enticing clues.
这个词是如何从“一个让你想要拥抱的人”变成“一个让你畏缩的人”，我们不得而知，但其中有一些诱人的线索。
For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
Understanding how parasites leap species barriers is crucial to understanding how new infectious diseases start in humans—and an example of a recent leap was also published this week.
了解寄生虫是怎样跳种种障碍是了解传染性疾病是怎样在人类之间传播的关键所在——最近一个迁徙的例子也在这周公布了。
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