The University of Illinois Extension says cabbage is easily transplanted from bare-root plants or cell packs.

VOA: special.2009.03.03

Packs of ice were put on my forehead to keep down the fever.

冰袋放在额头上用来降温。

耶鲁公开课 - 1945年后的美国小说课程节选

You can feel something cooling off right. I mean simple examples of these happen when you you know, if you buy cold or hot packs.

可以立即反应的东西,你可以感到有的东西会冷却，对吧？,我是说，举个简单的例子。

麻省理工公开课 - 热力学与动力学课程节选