Do you have a natural increase in population?

你觉得城市人口是自然增长吗？

But still the goal in many cases is to increase natural reproduction.

但在许多情况下，目标仍然是增加自然繁殖。

Village life began in Mesoamerica around 2000 BCE, leading to the Olmecs' rise by starting a natural increase in complex cultural and societal structures.

乡村生活始于公元前 2000 年左右的中美洲，通过开始自然增长的复杂文化和社会结构， 导致了奥尔梅克人的崛起。