far apart;utterly different ❍ 真真一个娘肚子里跑出这样～的两个人来，我想到那里就不服！ (《红楼梦》705) It really and truly passes my understanding how one mother could bear two such utterly different children!
天悬地隔tiān xuán dì ɡé
比喻两者相距很远，差别极大。be separated far apart, far apart, utterly different, hang apart as heaven and earth