The regular tetrahedron has four stable subgroups.

正四面体有四个稳定子群。

The culture of many subgroups is different from mainstream culture.

很多子群体的文化与主流文化有差异。

Bird dinosaurs were divided into a subgroup of dinosaurs.

鸟类恐龙被划分为恐龙的一个子群体。

In this paper, closed groups and proper subgroup are classified.

本文对闭群和真子群进行了分类。

Example 4: Creating a breakout subgroup.

例4：创建断接子组。

The subgroup members are treated as in step 2.

子组成员按照步骤2进行处理。

However, the country is just a subgroup of the world.

然而国家只是世界的一个子群体。

Now there is another subgroup and another targeted agent.

现在又有了另一个亚组及相对应的靶向药物。