This article describes the anatomical features of leaves of seventeen species of Aigeiros and Cathay Poplars.

本文描述了黑杨派和青杨派的17种杨树叶片的解剖构造,它们分属两种类型:等面叶和异面叶.

But they pose questions about what were the transitions in human evolution, why did those anatomical features change?

但他们对人类进化是如何进行的提出了问题，为什么这些解剖特点改变了？

This part of the evolutionary tree is very sensitive to small changes in how we interpret the anatomy and the combination of anatomical features we see in these animals as they are discovered.

进化树上的这一部分对我们如何解释结构特征的分解和组合变得非常敏感，对当它们被发现时我们看待它们结构特征的小小改变变得非常敏感。