他们学习如何寻找饮用淡水。
套管腐蚀会导致回注污水窜层，甚至威胁到饮用淡水层。
Casing corrosion could lead to cross-flow of re-injected sewage and even threatens fresh drinking water layers.
海水淡化技术能够将海水变为饮用淡水，但成本太昂贵，无法实现规模化。
Seawater can be changed into fresh water through seawater desalination technology, but it cannot be mass produced due to its high cost.
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