How fast would the disease develop?

这种疾病发展有多快？

《柯林斯英汉双解大词典》

How fast were you going?

当时你们走得有多快？

《牛津词典》

How fast can you type?

你打字有多快？

《牛津词典》

It can travel almost four hundred kilometers before it needs recharging, depending on how fast it is driven.

VOA: special.2010.11.17

And then, of course, not just whether the reaction will occur but, how fast it occurs is really important.

当然，我们不光要研究一个反应会不会发生,反应速率多块也是很重要的研究问题。

麻省理工公开课 - 化学原理课程节选

Second, he looked at these people and measured how fast they walk from where their experiment was to the elevator.

第二，他观察这些人,记录他们从实验地点,走到电梯的时间。

哈佛公开课 - 幸福课课程节选

Turn it into a Nexus, though, and watch how fast I reach for my wallet.

ENGADGET: Editorial: All I want for Christmas is a new HTC Nexus Mobile

Later, over drinks with the owner, Dr. Willet Whitmore, Gosnell discovered just how fast it was.

FORBES: Mine's Lighter

The question is how fast and how completely they can do it, and at what cost.

ECONOMIST: Wheat rust and world farming