也就是说，所有灵长类动物，除了人类，人类的巩膜是他们的三倍大，这一特征使得人类很容易跟随他人注视的方向。

All, that is, except humans, whose sclera is three times as large, a feature that makes it much easier to follow the direction of someone else's gaze.

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人类是高度复杂的社会性灵长类动物，所以我们对外界的反应很难用单纯的生物学或神经传递素来解释。

Humans are highly complex social primates and, because of this, our responses to the world can be difficult to explain with simple biology or neurotransmitters.

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由于之前从人类身上获取干细胞的报道被证明是造假，所以这是第一次灵长类动物胚胎被克隆成功。

The result was thus the first primate embryos to have been cloned, as earlier reports of human cloning turned out to have been fraudulent.

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