Coalbed methane reservoir is a pressure seal reservoir and its production characteristic is different from that of conventional natural gas.

煤层气是一种压力封闭型气藏，其生产特征不同于常规天然气。

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Developed nations are under intense pressure to agree to deep 2020 cuts in greenhouse gas emissions to try to seal an agreement at the end of this year that will replace the Kyoto Protocol.

想要在年底达成替代京都议定书的协议，发达国家在减排目标上面临巨大的压力，他们需要同意提高到2020年的减排额度。

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A new type of dry gas seal structure and working principle applied on high pressure ammonia pump were recommended.

介绍了一种新型高压氨泵采用干气密封的结构及工作原理。

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