The second problem is the nature environment of cities.

第二个问题是自然环境问题。

All our works are based on cherishing and protecting nature environment.

一切工作行为都紧记对自然环境的珍爱与维护。

The nature environment change of city has a strong effect on the growing of city forest.

城市自然环境的改变对城市森林的生长发育有深刻的影响。

Groundwater is a part of nature environment. Mans activity can impact the quality of groundwater.

地下水是自然环境的组成部分，人类活动会导致地下水质的变化。