1·I do not know reason.
我不知道原因。
2·I don't know reason.
我不知道原因。
3·Your ankle is just bothering you for some reason that you don't know.
你的脚踝只是因为一些你不知道的原因而困扰着你。
4·If we know around how old the Basin is, I'm not sure that's reason enough to go to the Moon again.
如果我们知道盆地的年龄，我不确定这是否足以成为再次登月的理由。
5·I'd like to know the reason why you're so late.
我想知道你为什么迟到那么长时间。
—— 《牛津词典》
6·Any friend of MINE walks where he likes in this country, or I'll know the reason why!
在这个国家，我的任何朋友都可以到他喜欢的任何地方去散步，否则我就得知道原因！
7·What's the reason he don't know it?
他为什么不知道？
8·And the reason we don't know about a lot of them is that they have vanished entirely.
我们不了解它们的原因是它们已经完全消失了。
9·Perhaps the reason why so many universities offer their students so little is they know studying at a top university remains a brilliant investment even if you don't learn anything.
也许这么多大学给学生提供的服务太少的原因是：他们知道，即使什么也学不到，在顶尖大学学习仍然是一项明智的投资。
10·I don't know the reason why you were absent from the meeting.
我不知道你为什么缺席会议。