你知道水的循环吗？
Now who can tell us the water cycle in the nature with these hints here?
学生看图说话，用自己的话讲述水循环。
This is on Earth's water cycle.
这就是地球上的水循环。
This process is called the water cycle.
这个过程称为水的循环。
Hydropower station water intake, water cycle, water release system.
一种水电站进水，循环水，泄水系统。
Hydropower station water intake, water cycle, water release system.
一种水电站进水，循环水，泄水系统。
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