这意味着一些井甚至在开采后还需要进行海水淡化，这增加了成本。

This means that some wells may even need to undergo desalination after extraction, thus increasing the cost.

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然而矿产资源是有限的，绝大多数开采后不能再生。

However, mining resources are limited and most of them can't be reproduced.

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煤层开采后，一些工作面出现了砂层水渗入井下的现象。

When the seam was extracted, water from the sand layer penetrated into some coal faces.

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