A new US study found why a very small proportion of arterial plaques become deadly and lead to heart attack or stroke and why the vast majority others stay benign and apparently do no harm.

美国一项新的研究已发现占小比例的动脉斑块致命并引起心脏病发作或中风的原因，以及大多数其它动脉斑块是良性的、无明显危害的原因。

youdao

That made me feel better, so I didn't ask her why the boy in the basement was making noises like a puppy, or why he had no hands or feet.

我感觉好多了，所以没有再问为什么地下室那个男孩会发出小狗一样的叫声，为什么他没有手和脚。

youdao

No one can understand why the soil their parents tilled has turned to desert, or why their skills have become useless and their family is left hungry.

没有一个人能够理解为什么他们的父辈辛勤耕耘过的土地变成了荒漠，为什么他们的劳动技能变得毫无用处，为什么他们的家人忍饥挨饿。

youdao

Experts say one of the reasons the gunfight is so interesting to many people is that no one knows who shot first or why.

VOA: special.2010.02.15

Why should I act in such a way if I have no expectation or reasonable expectation that those around me will reciprocate?

如果我对别人的报答,没有期望或合理的期望,我为什么要这样做？

耶鲁公开课 - 政治哲学导论课程节选

So it's easy to see why we might be tempted to say no mere machine could think or reason or have beliefs or desires.

所以很容易明白,为什么机器无法做到,我们刚才讨论的那些特质

耶鲁公开课 - 死亡课程节选

Just how far or why, no one really knows.

ECONOMIST: Italians don't know, but they blame the euro

There was no information about when or why he returned, and no details about whether he would actively take up the duties of office.

BBC: Hugo Chavez returns to Venezuela after Cuba cancer care

Quinn also isn't afraid to go into uncomfortable places, such as defending gun owners to a liberal crowd in New York or wondering why no one makes fun of President Barack Obama.

WSJ: Colin Quinn has fun with the US Constitution