Another version: hundreds of millions years ago here was a sea and an active underwater volcano that could produce not only steam but water-insoluble minerals as well.

另一种说法是：在成千上万年以前，这里是一片海洋，海底的火山活动频繁，这不仅可以产生蒸汽而且还有非水溶性矿物质等。

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The nano-dopant obtained by water-based sol-gel method was well dispersive and active.

通过水基溶胶-凝胶法合成了粉体颗粒均匀、高分散性、高活性的纳米掺杂剂。

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When the recovery of recoverable reserve is more than 80%, the single well fluid productivity rate will decline, the number of active Wells will reduce as the composite water cut is more than 90%.

可采储量采出程度达80%后，单井日产液、采液速度降低。综合含水达90%后，油井开井数降低。

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