translation.en: What we find is that over these 40-odd years that I and others have been studying chimpanzees and the other great apes, and, as I say, other mammals with complex brains and social systems, we have found that after all, there isn't a sharp line dividing humans from the rest of the animal kingdom.
translation.zh: 这四十多年来， 我和其他人一直在研究黑猩猩 和其他的大型猿类，还有， 其他的拥有复杂大脑和社会结构的哺乳类动物， 我们最后发现，没有一条很清晰的界线， 来区分人类和其他动物。