C.D.C.officials say people should put on sunscreen before they leave home, even on cloudy or cool days.

VOA: special.2010.07.06

What's happening there? Well, the selection of reactants has been done judiciously to provide either heat or to provide something that's cool.

就会感到这东西，比如说变冷了，对吧？,这里发生了什么？这些反应物都是,被仔细的选出来的，能够提供热量或制冷。

麻省理工公开课 - 热力学与动力学课程节选

If you want to go grab a drink or something, you go to Lefty O'Doul's right there. That's a cool little spot.

如果你想喝点什么的话，你可以去Lefty O'Doul's，地方不错。

充满乐趣 - SpeakingMax英语口语达人

Or,they enter the water to stay cool.

VOA: special.2009.08.19

Now to make that happen, it's not adiabatic, right. If I wanted to do that, I'd need a heating element or something to cool, so I could make that temperature change happen, right.

要实现这点，它就不会是绝热的，对吧，如果我想做到这点,我需要一个加热元件或什么制冷的东西,这样我才能让温度变化。

麻省理工公开课 - 热力学与动力学课程节选

"It's really cool to walk into public places, like a mall or something like that, and have people just go nuts,".

VOA: standard.2009.12.22