You know, I am still not too clear about the hydrologic cycle, the transfer of water back and forth between the earth and the atmosphere.

你知道，我仍然不是很清楚水文循环，也就是水在地球和大气之间的来回转移。

youdao

The hydrologic cycle is a useful starting point for the study of water supply.

水文循环是学习给水知识的有用的起点。

youdao

The circulation of water through this system is described by the hydrologic cycle.

水在这个体系中的循环是用水循环来描述的。

youdao

In parallel, the trends being observed in the different variables of the hydrologic cycle evidence the exacerbation of such conditions (Sixth Water Dialogue, 2006).

UNESCO: Climatic Change