We take our health for granted and only realise how important it is when we become ill.

我们觉得自己的健康是理所当然的，而且，只有在生病的时候我们才能意识它是多么的重要。

youdao

It is when we look at the changes between 2006 and 2009 that their scale becomes clear.

在我们观察2006年至2009年间的变化时，外部收支平衡状况的规模变得清晰起来。

youdao

But it is when we cometo the realm of the spiritual that we find the greatest depth ofhuman need.

但是，只有我们进入到属灵范畴的时候，我们才发现人内心最深的需求。

youdao

And when the system fails, it is my responsibility." President Obama campaigned on a promise of "change we can believe in."

VOA: special.2010.01.23

And especially when we consider it, what tends to be important is the size of wavelength in relationship to its environment.

特别是当我们考虑它的时候，波长的量级和它所处环境,的关系就显得非常重要。

麻省理工公开课 - 化学原理课程节选

And specifically, when we talk about ionization energy, it's assumed that what we mean is actually the first ionization energy.

特别地，当我们讨论电离能的时候，我们默认,这指的是第一电离能。

麻省理工公开课 - 化学原理课程节选

It is when we look at specific cases and regions where some of the results cause surprise.

FORBES: When It Comes To Health, Wealth And Happiness, Human Freedom Matters

As with everything, it is when we know how the brain works that we can have something to say about how to work it.

CNN: Manage your brain -- it's your most important asset

It is when we begin to map what we know into what others know (or vice versa) that truly powerful and revolutionary things can start to happen.

FORBES: The Knowledge Revolution Is Not About Big Data, It's About Well-Connected Little Data