The real reason is probably that we don't have enough sleep.

真正的原因可能是我们没有足够的睡眠。

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And,he said the real reason officials removed the video is because of the exhibit's main subject,gay love.

VOA: special.2010.12.15

There's a reason we like sugar, and there's a real reason when we like the two of them together in something like ice cream.

我们喜欢糖也是有原因的,我们喜欢二者兼备的食物,比如像是冰淇淋,是非常有道理的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The real reason of course is laziness.

当然，懒惰才是真正的原因“

耶鲁公开课 - 1945年后的美国小说课程节选

The real reason, especially if true, would be a lot easier to live with.

NPR: Congress, White House Clash on Hearing Rules

You do not like to change things unless there is a real reason for changing.

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If the whole thing was a put-on, on some level, what was the real reason?

FORBES: Ten Years Later, It's Still Not Clear Why We Invaded Iraq