形容相差极为悬殊。《清史稿・卷四九一・忠义传五・李福培传》:“恩绶无守土责,而视死如归,不特与草间偷活判若天渊,即较之城亡与亡亦分难易。”亦作“判若云泥”。
英语 as far apart as sky and sea(as far apart as the sky and the abyss)