◎ 镀金 dùjīn(1) [water-gild]∶附金于[金属表面],其法是先用金汞薄薄地镀上一层,随后加热使汞挥发(2) [gold-plate]∶用金来电镀(3) [get gilded;formerly said of students who went abroad to study in order to enhance their social status]∶比喻为虚名而到某地进行所谓的深造或锻炼 -----------------国语辞典：以薄层的黄金镀在器物的表面上。讥讽人到某种环境去深造或锻练后，洋洋得意，自恃高人一等，而实际上只有虚名，并无真才实学。如：「出国后应脚踏实地的求学，否则即使拿了学位，空得镀金虚名，也是枉然。」