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1·The reason is blindingly obvious.

原因十分明显。《牛津词典》

2·Midge couldn't quite put her finger on the reason.

米吉不能非常确切地指出原因所在。《柯林斯英汉双解大词典》

3·The reason for my visit had obviously slipped his mind.

我到访的原因显然被他忘了。《柯林斯英汉双解大词典》

4·The reason was obvious.

原因显而易见。

5·The reason is simple.

原因很简单。

6·The reason: so many similar people go elsewhere.

原因是很多类似的人都去了别的地方。

7·This is the reason you are here in a university.

这就是你上大学的原因。

8·This is the reason you are here at a university.

这就是你在这里上大学的原因。

9·The reason was so simple: I'm fond of her too.

原因很简单：“我也喜欢她。”

10·Is that the reason so many tea-things are put out here?

那就是这儿有这么多茶具放出来的原因吗？