in fours in groups of four people or things四个一组:•The boxes were stacked in fours.箱子四个一组堆在一起。⇒FOURSOMEin fours每组四个;每次四个：Pupils are led to visit a museum，according to the museum’s regulation，pupils are admitted in fours.小学生们被带领去参观一个博物馆，按照这个博物馆的规定，学生们只准每四个人为一组进去。 |