Explain why you didn't telephone.

解释一下你为什么不打电话。

《柯林斯英汉双解大词典》

Let me explain why.

让我来解释为什么。

《柯林斯英汉双解大词典》

I think that's my cue to explain why I'm here.

我想这就是要我解释一下我为什么到这里来。

《牛津词典》

He says the way most running shoes are designed may explain why those who wear them land on their heels.

VOA: special.2010.02.03

But we've just introduced it, so let's go back to the class notes and explain why this is the correct answer.

但是由于我们刚刚开始介绍它，因此让我们回到课堂讲义来解释一下,为什么这个是正确答案。

麻省理工公开课 - 化学原理课程节选

You say, "This happened" and then the second part of the sentence after "so ~ that" will explain why it happened.

你说，“现在是这样的情况”，然后将另一部分内容放在“so ~ that”后，来解释这种情况发生的原因。

so that 课堂 - SpeakingMax英语口语达人

All this helps explain why shares of Netherlands-based EADS, maker of Airbus planes, continue to outperform.

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And they explain why Europe is in trouble and why Illinois is in trouble.

FORBES: Illinois Downgrade Provides More Evidence that Higher Taxes Make Fiscal Problems Worse, not Better

These practices help explain why such a broad range of pricing exists for similar accounts.

FORBES: Price Wars Heat Up Investment World