group本身可作名词。a group of可以看作group的形容词。
groupn.组；群；批；类
The group was considered to be a risk to national security.
这伙人被认为是威胁国家安全的危险分子。
The two groups have merged to form a new party.
两大组织合并组成一个新党。
How can we best meet the needs of all the different groups?
我们怎样才能最好地满足各种人的需要呢？
