The group met to develop a quality improvement plan for dealing with the problem in the United States.

VOA: special.2009.10.26

And obesity is a huge problem in the United States, especially in the African american community and other minority communities.

在美国,肥胖症是一个严重的问题,尤其在非裔美国人和,其它少数民族群体中

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I started thinking, you know what, the reason why in the United States we have such a problem,

你知道我开始想什么了吗，我在想为什么在美国我们会出现如此的问题，

发挥创造力的瞬间 - SpeakingMax英语口语达人

Two recent newspaper stories underscored a problem several states are experiencing--stagnant or falling populations.

FORBES: Fact and Comment

One problem with states taking these matters into their own hands is that their decisions affect the standards for the entire nation.

FORBES: California's Proposition 37: An Impending "Natural" Disaster?

Uranium 235 is the key material in starting a nuclear reaction, and its acquisition is the main problem facing states which want to go nuclear.

BBC: Nuclear threat casts global shadow