He collected some books and spent a lot of time reading about how to know if a pair of shoes fit properly.

他收集了一些书，花了很多时间阅读如何挑选合适的鞋。

youdao

How to know if Email Triage is right for you?

怎么知道电子邮件分流是否适合你？

youdao

Confused yet? Here's how to know which is which.

哈，晕了吧？来看看如何知道谁是谁？

youdao

He said he would get it, but first he wanted to know how big she thought the moon was.

VOA: special.2009.03.28

So we can go ahead and name our molecular orbital, just like we know how to name our atomic orbitals.

我们可以继续命名分子轨道，就想我们知道如何命名原子轨道一样。

麻省理工公开课 - 化学原理课程节选

or to know how to, you know, put a man on the moon, but I think,

或如何把人类送上月球，但是我认为

文学是灵魂的方式 - SpeakingMax英语口语达人

How to know: Watch the price of gold--still the best barometer of monetary weather changes.

FORBES: Fact and Comment

Yes, I've had to learn how to know when to speak and what to say, when to say it.

NPR: Hip Hop Takes on Diplomatic Role with State Department

If you wondering how to know whether your breasts are dense, the best thing to do is ask your doctor.

CNN: Do digital mammograms make a difference?