劍橋詞典?cross the Rubicon to do something that you cannot later change and will strongly influence future events 破釜沉舟；下重大決心；采取斷然行動 Most EU states have crossed the Rubicon and adopted the euro . 大多數(shù)的歐盟國家已經(jīng)下了決心采用歐元。 返回 Rubicon