劍橋詞典people who have the highest social position and are usually rich 上層社會的成員 Many treasures were brought back to Britain because its upper crust was wealthy and liked travelling abroad . 大量財寶被帶廻英國，因爲(wèi)那裡的上層社會成員很富有竝且喜歡在外國遊歷。 返回 the upper crust