However,difficult economic times in the United States hurt the family's businesses.

VOA: special.2009.10.04

However, for dietary intake, there have been fewer advances like that because it's such a difficult thing to get a hold of.

然而,对于饮食摄入量,和那些比则进步要少,因为这很难把握

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Lee,however, would find it more difficult to replace his soldiers.

VOA: special.2009.10.15