撒哈拉沙漠下面是巨大的含水层，基本上是一片淡水的海洋，那可能是经过岩石层过滤的，已经有一百万年历史。
Beneath the Sahara are huge aquifers, basically a sea of fresh water, that's perhaps a million years old filtered through rock layers.
"因此，人们认为充满水分的岩石样本的总含水量既包括可能会渐渐流失的水分，也包括不会流失的水分。
The total volume of water in the saturated sample must therefore be thought of as consisting of water that can, and water that cannot drain away.
如果属实，这将表明岩石行星很普遍，而且暗示了大多数此类行星都含水。
If so, it would suggest that rocky planets are common, and hints that most such planets have water.
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