That is, if you see a law on the books, well, the reason why that law is on the books is because not everyone would behave according to the specifications of the law.

也就是说，如果你看到书本上有哪条法律，那么为什么书本上存在这样的法律呢，原因在于不是每个人的行为都符合法律规范。

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The reason why the injection needs repeating every year is that the virus changes.

每年需要重新注射的原因是这病毒经常变化。

《牛津词典》

That was the very reason why he felt a certain bitterness.

那正是他感到有点痛苦的原因。

《柯林斯英汉双解大词典》

And that's part of the reason why South Korea scores badly in the index."

VOA: standard.2009.11.05

The reason why I have "Time-ins"... This is something that I am introducing this year for the first time.

之所以进行“练习时间。,这是今年新提出的。

哈佛公开课 - 幸福课课程节选

The main reason why I say that is actually not necessarily because of what's in the museum, but because of the museum itself.

我这样说，并不一定是因为博物馆里的东西，而主要是因为这个博物馆本身。

喜欢的艺术家 - SpeakingMax英语口语达人

The reason why that old knee injury still bothers you is because you almost certainly tore the cartilage in your knee.

FORBES: Nanofiber Spheres Allow for Tissue Regeneration

The reason why that's exciting, is one of the properties we'd like to have on a habitable planet is liquid water on the surface.

BBC: Tiniest extrasolar planet found

Recent research has uncovered the reason why that can be so difficult, and a simple and effective strategy you can use to keep motivation high.

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