为了能在日趋恶劣的环境里开枝散叶、生息繁衍，我们需要拥有更新、更加进化的技能。
We need some new evolutionary tricks in order to spread out into increasingly hostile environments.
从进化的角度说，其主要目的是开枝散叶。
From an evolutionary point of view, the major objective is to spread their genes more effectively.
该发现表明，羽毛中的羽枝和小羽枝是先于羽轴进化出来的。
The finding suggests that the barbs and barbules evolved before the rachis in feathers.
一个进化枝是一个分支，是物种分类中使用的形式。
A clade is a 'branch' and is a term used in the taxonomy of species.
本文中我们把根系形成必需的四种PLT同源族用进化枝表示出来，启动子活性及PLT蛋白融合显示出在干细胞上最大的坡度分布。
Promoter activity and protein fusions of PLT homologues display gradient distributions with maxima in the stem cell area. PLT activities are largely additive and dosage dependent.
这一化石形成的时代是羽毛或类似羽毛的附属物开始出现的时代，但是这种恐龙来自一个更加原始的进化枝。
The fossil dates from a time period when feathers or feather-like appendages have been seen, but the dinosaur is from a branch of the evolutionary tree that is more primitive.
它们原来是一类的，3千万年前有一枝分离出来进化成猿和人类。
They're part of a group that split 30 million years ago from the group that gave rise to apes and humans.
它们原来是一类的，3千万年前有一枝分离出来进化成猿和人类。
They're part of a group that split 30 million years ago from the group that gave rise to apes and humans.
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