The army has not yet proffered an explanation of how and why the accident happened.

军队还没有提供对该事故如何发生以及为什么发生的解释。

《柯林斯英汉双解大词典》

First of all, it seems that a successful scientist is full of curiosity—he wants to find out how and why the universe works.

首先，一个成功的科学家似乎都充满了好奇心——他想知道宇宙是如何运作的以及为什么会这样。

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This is partly because design museums clearly show how and why mass-products work and look as they do, and how design has improved our lives.

这在一定程度上是因为设计博物馆清楚地展示了批量产品的工作原理和外观，以及设计如何改善我们的生活。

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She developed the theory explaining how and why the ozone hole happens over Antarctica.

VOA: special.2009.03.13

It has traditional stories and legends, some quite fanciful, Whose goal it is to explain how and why something is what it is.

它讲述了一些传统故事，有一些还极具想象力，它们试图解释事物的形成方式及成因。

耶鲁公开课 - 旧约导论课程节选

Dakota And this is one of them from 2002 called Dakota, and I think you will see immediately how and why it is related to On the Road.

而这个作品是其中2002的系列之一叫做，我想你们能很快地明白,这个作品和《在路上》有什么样的关联。

耶鲁公开课 - 1945年后的美国小说课程节选

Next step: look to whom we are choosing to interact with, how and why.

FORBES: Why Your Unhappy Personal Life Is Good For Your Career

As the company understands how and why IT is helping the business two things will happen.

FORBES: Eight Steps For Addressing the IT Management Crisis

Exactly how and why things have gone so wrong is a matter of debate.

ECONOMIST: The world's biggest carmaker is at sea and floundering