1. We can group animals into several types. 我们可以把动物分成几类。
2. I think this behavior should be praised and I hope more people join this group. 我认为这种行为应该得到表扬，并希望更多的人加入这个群体。
3. There are those with terrorist genealogy in the mainstream of every group of humans. 在每一群人类的主流中，也有拥有恐怖分子宗谱的那些人。
英英解释
n.
1. any number of entities (members) considered as a unit
2. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
3. a set that is closed, associative, has an identity element and every element has an inverse v.
1. arrange into a group or groups
2. form a group or group together
