one ...the other中的other为什么可以作名词,后面可以不加名词了

one .the other...一个...另一个...There are two bags on the shelf,one is red,the other is blue.（架子上有两只包,一只是红色的,另一只是蓝色的）some... others...一些...其余的.Boys are on the playground,so...