What does the brain do while we are sleeping?

当我们睡觉时，大脑在做什么？

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What do people tend to do while engaging in a conversation?

人们在交谈时倾向于做什么？

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While they were in the brain-scanning machine, they were asked to do tasks that required concentration and attention.

VOA: standard.2009.12.19

Video on-demand has to do with the delivery what they call content, while the video phone is the deliver of person-to-person communication. These are not nearly the same, but they both involve video.

随需视频必须与传送他们所称的“内容“相关,而视频电话是一种,个人对个人的传送，那不是,大致相同的，但它们都包含视频。

麻省理工公开课 - 媒体、教育、市场课程节选

Dollet adds that while there are other Arabic-speaking countries that do not control the Internet as much as Egypt, it is not clear how long that relative freedom will last.

VOA: standard.2009.11.16

They could do what the Democrats allege: Scale back tax preferences in such a way that middle-income households pay higher taxes than they do today while high-income people enjoy a tax cut.

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She calls it a must-do activity while in Costa Rica.

CNN: Costa Rica's oasis

We can either settle for a country where a shrinking number of people do really well - while a growing number of Americans barely get by - or we can restore an economy where everyone gets a fair shot, everyone does their fair share, and everyone plays by the same set of rules.

BBC: Defiant Obama speech draws battle lines