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However, further research has shown that it is the normal condition for humans and for most other mammals. It seems pretty clear why this is the case for most mammals and for most human beings.
然而，进一步的研究表明，这是人类和大多数其他哺乳动物的正常情况。对于大多数哺乳动物和人类来说，这似乎是显而易见的。