As I said in my press conference with President Jiang, we have an ongoing quest ourselves to live up to those ideals. The people who framed our Constitution understood that we would never achieve perfection. They said that the mission of America would always be "to form a more perfect union"—in other words, that we would never be perfect, but we had to keep trying to do better.
The darkest moments in our history have come when we abandoned the effort to do better,when we denied freedom to our people because of their race or their religion, because there were new immigrants or because they held unpopular opinions. The best moments in our history have come when we protected the freedom of people who held unpopular opinion, or extended rights enjoyed by the many to the few who had previously been denied them,making, therefore, the promises of our Declaration of Independence and Constitution more than faded words on old parchment.
每当我们放弃不断改进的努力，每当我们由于种族或宗教原因、由于是新移 民，或者由于有人持不受欢迎的意见，而剥夺我们人民的自由，我们的历史就出现最黑暗的时刻。每当我们保护持不受欢迎的意见者的自由，或者将大多数人享受的权利给予以前被剥夺权利的人们，从而实践《独立宣言》和《宪法》的诺言，而不是使其成为一纸空文，我们的历史就出现最光明的时刻。内容来自 听力课堂网：http://www.tingclass.net/show-9203-295525-1.html