Settlers in the American west also had a problem faced by many people in the world today.

VOA: special.2010.04.15

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

"It is an age-old problem in politics, where in general in American politics, the candidate who appeals most to the most fervent members of the party wins the primary and then often has a very difficult time appealing to the broader electorate."

VOA: standard.2010.05.19