European researchers are studying bats to understand why they live so long.

欧洲研究人员正在研究蝙蝠，以了解它们长寿的原因。

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With his owlish face, it is easy to understand why he was called "The Professor."

看看他那猫头鹰般的脸庞，就不难理解为什么他被称为“教授”了。

《柯林斯英汉双解大词典》

It was difficult for her to understand why she had married.

VOA: special.2009.06.27

And I also wanted you to identify why, it's also important to understand why we have these trends, not just to memorize the trend itself.

而且我还需要大家判断原因是什么，这很重要，对于我们理解,为什么有这些规律，仅仅记住这些规律是不够的。

麻省理工公开课 - 化学原理课程节选

Because they wanted to understand why.

因为他们想知道为什么。

哈佛公开课 - 幸福课课程节选

Denis O'Brien professes not to understand why wall Streeters think his telecom business is risky.

FORBES: Babble Rouser

In order to capture this group, it is important to understand why consumers select a store.

FORBES: What it Takes to Capture and Keep Loyal Consumers: Part I

Government officials are at a loss to understand why inward investment has dried up.

ECONOMIST: Farewell, golden goose | The