But in a few months, the rains will come and camp residents worry about their tents many made of bed sheets.

VOA: standard.2010.02.02

most chemical and biological systems aren't that simple precisely because you have to worry about many particles and their statistics and the way they might order or disorder.

大多数化学或者生物系统并不是这么简单,因为你必须担心大量的粒子,和他们的统计特性以及它们有序,和无序的情况。

麻省理工公开课 - 热力学与动力学课程节选

But many economists say the bigger issues to worry about include bad bank debt and lack of liquidity.

VOA: standard.2009.04.02