孩子们在公园里玩耍时展现出的快乐，正是他们亲近自然的天性体现。

The joy children show while playing in the park reflects their inherent ___biophilia.

亲近自然的倾向可能源于人类进化历程中的生存需求。

The concept of ___biophilia suggests our love for nature is rooted in evolutionary survival needs.