以下为句子列表：
英文: They have argued that methane—with many times the heat-trapping capacity of carbon dioxide—may have been more abundant, in part because it could stick around a whopping 10,000 years in the oxygen-poor atmosphere of the past.
中文: 他们提出，在当时，甲烷（一种比二氧化碳更有效率的温室气体）的含量可能非常丰富，部份原因是甲烷在缺少氧气的远古大气中，生命期长达一万年的时间。
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