据说地球拥有的地下水量大约是其拥有的河流
It is said that the amount of groundwater the Earth has is approximately the same as the amount of rivers it has
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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