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.
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