why,when we do not sleep, we do not function well. We just do not know much about sleep at all."

VOA: special.2009.08.26

Thermodynamics is asking you, what work does this thing do on the surroundings or the surroundings do on the system?

热力学在问你们，到底是系统对环境做功,还是环境对系统做功？

麻省理工公开课 - 热力学与动力学课程节选

It's got exercises for you to do so at the end of each chapter, you do have a task to do.

里面为你准备了练习，所以在每章的结尾，你都有任务要完成。

英语写作：技巧 - SpeakingMax英语口语达人

Another 15% do have old-fashioned phones but still do most of their calling on mobile products.

FORBES: The Young Aren't The Only Ones Going Wireless

How do we actually deal with this issue and how do we come through this.

BBC: Rocky times

Ian has got his job to do, and I have got my job to do.

BBC: Ashton defends Cipriani decision