n.分类；类别
There is a hierarchy in the classification of all living creatures. 一切生物均可按等级分类。
It is helpful to begin with a rough and ready classification. 首先进行粗略的分类是很有帮助的。
Such classification tends to detract from generality. 这样的分类方法缺乏概括性。
These things belong in a different classification. 这些东西属于不同的类别。
