众所周知谁是生态系统中声明必需元素得以不断运动的介质，没有水循环就没有生物地化循环。

As we all know who is the essential element of the ecosystem in a statement to the media in constant motion, not the water cycle there is no biological way of cycling.

youdao

众所周知谁是生态系统中声明必需元素得以不断运动的介质，没有水循环就没有生物地化循环。

As we all know who is the essential element of the ecosystem in a statement to the media in constant motion, not the water cycle there is no biological way of cycling.

youdao