Mandy Joye: the methane concentrations in these plumes are 100 to 10, 000 times what you would normally see in Gulf of Mexico water.
曼迪·乔伊：墨西哥湾原油层甲烷气体浓度是正常情况下的100到10000倍。
Current methane concentrations in the Arctic average about 1.85 parts per million, the scientists said, the highest in 400,000 years.
目前在北极地区甲烷浓度平均为大约百万分之1.85，科学家们说，这是40万年中的最高水平。
This was observed by diamond deposition on iron substrates where, due to the high vapor pressure of iron, ballas is formed at methane concentrations lower than 0.4%.
这一点是在铁基体上沉积金刚石时发现的。这时，由于铁的蒸汽压力很高，在甲烷浓度低于0.4%时可形成半刚石。
Through comparison and analysis of nearly 15 years in East Asia atmospheric carbon dioxide, methane concentrations and changes in the trends in the global average is high.
通过对比分析，近15年东亚地区大气中的二氧化碳、甲烷的浓度和变化趋势高均于全球平均水平。
She talked to EarthSky about the high concentrations of methane gas she discovered in oil plumes deep beneath the surface of the Gulf.
她告诉EarthSky，深海处的原油层已经产生了高浓度的甲烷气体。
She talked to EarthSky about the high concentrations of methane gas she discovered in oil plumes deep beneath the surface of the Gulf.
她告诉EarthSky，深海处的原油层已经产生了高浓度的甲烷气体。
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