First, semi ring of fractions of a semi ring about a multiplicative closed subset in it is constructed.

先构造交换半环关于其乘法封闭子集的分式半环；

youdao

First, semi ring of fractions of a semi ring about a multiplicative closed subset in it is constructed.

先构造交换半环关于其乘法封闭子集的分式半环；

youdao