The UN health agencies say it could cost about $39 billion over the next six years to scale up the recommended measures in the 68 high-risk developing countries.

VOA: standard.2009.11.02

And the temperature scale that turns out to be well-defined and ends up giving us the concept of an absolute zero is the ideal gas thermometer.

比如理想气体温标,它有精确的定义,并能引出绝对零度的概念,今天我们就先来谈谈它。

麻省理工公开课 - 热力学与动力学课程节选