The arrival of millions of unassimilated immigrants is requiring America to abandon the old notion of a melting pot and turn itself instead into a gorgeous mosaic in which distinctive ethnic groups still manage to make a whole.
參考答案:
要點：本句是長句而非難句，因爲句子中沒有任何複雜結構。句子的`句架是The arrival of millions of unassimilated immigrants is requiring America turn itself instead into...。which引導定語從句修飾先行詞a gorgeous mosaic。
譯文：數百萬未被同化的移民的到來要求美國放棄熔爐的舊觀念，並把自己轉化成一件努力將不同的種族融合在一起的璀璨的鑲嵌藝術品。
