科学家们一度以为这种生产姿势是从现代人类的灵长类祖先进化而来的。
Scientists had believed that this birth position evolved in the primate ancestors of modern humans.
一份新的研究显示。鉴别具有威胁性的蛇的能力可能最终形成了我们的灵长类祖先的视觉系统。
The ability to detect threatening snakes may have shaped the visual system of our primate ancestors, a new study says.
其他特征，比如特别长的前臂以及灵活的双脚，这些可以追溯到我们过去的灵长类祖先很晚才具有的特征。
Other features, such as extra-long forearms and flexible feet, date from deep in our primate past.
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