There are four kinds of pigeons.

有四种鸽子。

In the background, there are four or five houses.

在背景，有四五座房子。

There are four chairs in this room.

这间房间里有四把椅子。

There are four corners in a square.

一个正方形有四个角落。

In Peking Opera, there are four roles: male roles, female roles, painted roles and clowns.

京剧中有生旦净丑四种角色。

There are four kinds of different ice cream.

有四种不同的冰淇淋。

There are four different levels of trees in a rainforest.

雨林中有四种不同层次的树木。

There are four villas in front of our building.

我们楼前有四栋别墅。

There are four computer in there.

在那里有四台计算机。

There are four shows today.

我们今天有四个节目。