There are three different sorts of monopoly: natural monopoly, artificial monopoly, and state monopoly.

垄断有三种：自然垄断，人为垄断以及国家垄断。

youdao

There are three different sorts of monopoly: natural monopoly, artificial monopoly, and state monopoly.

垄断有三种：自然垄断，人为垄断以及国家垄断。

youdao