By Melinda Smith Washington, D.C. 12 June 2007 Obesity is a worldwide problem. Researchers have still not come up with the perfect diet or pill to help those who need to lose weight keep it off. The latest drug to show some promise is a synthetic hor

发表于:2019-02-05 / 阅读(140) / 评论(0) 分类 2007年VOA标准英语(六月)