One big unknown is the stage at which dangerous tipping points would be reached that lead to further warming - for example the release of methane hydrate deposits in the Arctic.

现在存有一大未知数，即到达导致气候进一步变暖的危险临界点时的情形——比如储存在北极甲烷水合物被释放出来。

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Soluble lead sulfide can be extracted from the residue by 10% hydrogen peroxide, 15% ammonium acetate and 5% acetyl hydrate.

用10%过氧化氢—5%醋酸—15%醋酸铵浸取上述残渣，可浸取溶解硫化态铅；

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Once the hydrate formate, it will lead to block pipes and equipments, even gas well's off production, pipeline shutdown, and other serious accidents.

水合物一旦生成，会导致管道和设备的堵塞，甚至造成气井停产、管道停输等严重事故。

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