When the balloon goes up.(当大事发生时)和Then the balloon went up.(接着,大事发生了)是两句时态不同的相同成语。在没有飞机的时代,气球升空该是一件大事。现在,这两个成语所表示的大事情多是不愉快的,并且多是人们早就担心会发生的。
Her parents were abroad, then the balloon went up in 1939 and they could not return home until the war was over. (她的父母当时在国外。接着,在一九三九年情况终于突变,一直到战后他们才得以回国。)