The move toward upright walking is a main division between human and ape development.

直立行走是人类和类人猿发育的主要区别。

Synapsids were one of the four main divisions of early reptilian life, the others being anapsids, euryapsids, and diapsids.

下孔亚纲是早期爬行动物的4个主要部之一，其他3个部分别是缺孔亚纲、调孔亚纲和双孔亚纲。

Of the twenty-three main divisions of life, only three-plants, animals, and fungi-are large enough to be seen by the human eye, and even they contain species that are microscopic.

在23种主要生命形式中，只有3种——植物、动物和真菌——大到人的肉眼能看得见的程度。即使在它们中间，有的种类也是极小的。

I allude to the manner in which species belonging to several of the main divisions of the animal kingdom suddenly appear in the lowest known fossiliferous rocks.

我提到了属于动物界几个主要分支的物种突然出现在已知最低的含化石岩石中的方式。

If we look even to the two main divisions—namely, to the animal and vegetable kingdoms—certain low forms are so far intermediate in character that naturalists have disputed to which kingdom they should be referred.

如果我们甚至看一下两个主要部分— —即动物界和植物界— — 某些低等类型的特征迄今为止处于中间状态， 以至于博物学家对它们应该归入哪个王国存在争议。