Well, it's often said that the reason why the United States has become a first-class world power is because it has garnered the best and brightest from around the world and allowed them to give free rein to their talents and intelligence. So the U.S. is said to be a melting pot of nations.
我們說美國之所以變成這樣一個世界一流的強國，是因為它吸收了世界各地優秀民族的精華，在美國聚集在一起，大家發揮自己的聰明才智，才建立起今天一個了不起的美國，所以我們說美國是一個民族大熔爐。