Matels expand when heated and contract when Cool.

金属遇热时膨胀，冷却时收缩。

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When cool, autumn leaves are no longer so affectionate.

当秋天渐凉，落叶不再那么多情。

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If you plant the seeds outside when the weather is cool, place the seeds under a glass.

VOA: special.2009.04.21

So when I expand this gas adiabatically and it cools down, why do you think it might cool down?

现在我们知道了气体绝热膨胀时,温度会下载，为什么会降温？

麻省理工公开课 - 热力学与动力学课程节选

Some really, really cool things can emerge when you're not just stressing yourself out

你不把自己逼得很紧的时候就会有真的真的很酷的主意产生。

艺术从自由起步 - SpeakingMax英语口语达人

When cool enough to handle, one ear at a time, hold the corn upright on a cutting board.

NPR: Recipe: 'Inspired by Ingredients'

But shunning salads is no way to live, especially in the summer months, when cool, green salads are especially enticing.

FORBES: Seven Simple Steps To Safe Salads

Times like these, with everybody panicking, ought to be the moment when cool-headed investors step in and make a fortune.

ECONOMIST: Have markets got what they wanted at last?