他们在邮政服务上拥有垄断地位。

They have a ___monopoly on the postal service.

事实上，很明显，计划在我们地区开设第二家超市的原因与第一家超市目前的垄断有关。

In fact, it is quite obvious that the reason why a second supermarket is planned in our area is related to the current ___monopoly of the first supermarket.

政府旨在打破电信行业的垄断。

The government aims to break the ___monopoly in the telecommunications industry.