稀少现象是一切地方的一切纲内的大多数物种的一个属性。
Rarity is the attribute of a vast number of species of all classes, in all counties .
同一纲内一切生物的亲缘关系，常常可用一株大树来表示。
The affinities of all the beings of the same class have sometimes been represented by a great tree.
同一纲内一切生物的亲缘关系，常常可用一株大树来表示。
The affinities of all the beings of the same class have sometimes been represented by a great tree .
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