据说地球拥有的地下水量大约是其拥有的河流和湖泊水量的三千倍，而且地下水要干净得多。
The world is said to have about 3,000 times as much groundwater as water it has in rivers and lakes, and groundwater is far cleaner.
据说地球拥有的地下水量大约是其拥有的河流和湖泊水量的三千倍，而且地下水要干净得多。
The world is said to have about 3,000 times as much groundwater as water it has in rivers and lakes, and groundwater is far cleaner.
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