One is teacher ,the other is student .为什么the other后面不加名词

问题描述:

One is teacher ,the other is student .为什么the other后面不加名词
怎么可以随便省略,

One is teacher ,the other (one) is student .
one省略
前面有one 后面就省略了 就像我们说话不也是常会省略