on this account

原因───reason;这个───this

I had a bad night; I went to bed early enough, but for some reason I couldn't get off to sleep.───我夜里睡得很不好, 上床相当早, 可是不知为什么睡不着.

I'll do any thing within reason to oblige.───凡能做到的我都愿效劳[尽力].

a bona fide reason───真正原因

The reason is blindingly obvious.───原因十分明显。

He thought of a reason to explain away his failure.───他想出一个理由为他的失败辩解.

I really don't see any reason for changing it.───我真的不明白为什么要改变它。

He went beyond the bounds of reason in those days.───他那时候太狂妄了.

The person may become dizzy for no apparent reason.───这类人可能会莫名其妙地感到头晕。