human nature
noun [ U ] uk/ˌhjuː.mən ˈneɪ.tʃər/ us/ˌhjuː.mən ˈneɪ.tʃɚ/
人性
the natural ways of behaving that most people share
You can't change human nature. 你无法改变人性。
It's only human nature (= it is natural) to want the best for your children. 希望自己的孩子得到最好的乃是人之常情。