The sulfate is one of the key factors for controlling the percentage of hydrogen sulfide in natural gas reservoirs besides temperature and buried history of gas reservoirs.

硫化氢含量较高的气田和层位普遍发育硫酸盐岩，这是控制天然气藏硫化氢含量的关键因素，温度和时间也是重要的影响因素。

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The most destructive century in all the millennia of human history was only just concluding; it was not buried in some deep, dark ancient past.

在人类数千年的历史中，最具有破坏性的一个世纪刚刚告一段落，人们还没有将它埋入深不可测的上古深渊。

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So let us take a look at some of the most famous Orion controversies, where doubts supersede the specified proofs and the real answers still remain buried as the darkest truths of the history.

因此，让我们看看最有名的争论，其中怀疑取代指定的证明，看看一些真正的答案仍然作为历史上最黑暗的真理埋葬。

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But a few short years later Atari's machine, the 2600, was history, buried under a rash of poor-quality games.

FORBES: Pixelated dreams

And - but what's happened is we've realized that the true history of our people is still buried in archives.

NPR: Scholar Helps Black Americans Trace Family Roots

Alex Scott, SNH area officer for West Sutherland and Wester Ross (North), said the caves provided a unique record of Scotland's ancient history, as glaciers during the Ice Age erased many remains buried just below the surface of the ground.

BBC: NEWS | UK | Scotland | Highlands and Islands | New tests on rare polar bear find