What they fear was that the political challenges of sustaining support for global economic integration will be more difficult in the United States because of what has happened to the dis; tribution of income and economic insecurity.

　　他们担心的是由于收入分配和经济安全出现问题，美国政府将很难应对为全球经济一体化提供持续支持这一政治挑战。

　　六级词汇讲解：

　　本句的主干结构是“What they fear was+that引导的宾语从句”。其中what they fear是由what引导的主语从句，作句子的主语;because of…economic insecurity是原因状语。

　　sustain的意思是“保持，使……持续下去”。如：

　　The clapping was sustained for several minutes.

　　掌声持续了好几分钟。

　　integration的意思是“整合，集成”，global economic interation的意思是“全球经济一体化”。distribution的意思是“分配”。

　　英语六级考点归纳：

　　从属连词because引导原因状语从句，有几点需要注意：

　　because引导的原因状语从句常常可以简化成介词短语because of.如：

　　She didn't attend the meeting because she was ill.

　　因为生病，她没有去开会。

　　可以简化为：She didn't attend the meeting because ofher illness.because可用于强调句结构It is because…that…，并且可以在because前加only或just来加强语气。如：

　　It was only because he is the son ofthe headmaster that he gained the opportunity to participate in the competition.

　　就因为他是校长的儿子，他获得了参赛的资格。

　　not…because结构有时否定从句部分，表示“并非是……的缘故”。如：

　　The motor did not stop running because the fuel was finished.

　　摩托车停止运转，不是因为燃料耗尽。(此句容易误解成“摩托车没有停止运转是因为燃料耗尽了”，这显然不符合逻辑。)