The model of combustion fraction for dense phase in circulating fluidized bed combustor has been built up, based on thermal balance, gas analysis and total gas amount.

建立了基于热平衡法、烟气分析法和烟气量法的循环流化床锅炉燃烧室密相区燃烧份额计算数学模型，并分析比较了各种模型的特点。

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Extrapolating from lake depths on Earth, the researchers estimate several of the lakes on Titan each contain more than the total amount of natural gas on Earth, estimated to be about 130 billion tons.

科研者们根据地球上的湖泊的深度推断，泰坦上有几个湖泊中每个湖泊的天然气含量都超过地球上的总量，估计有1300亿吨之多。

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However, the growing gas demand, total amount of city gas supply shortage and load capacity of the contradiction, which poses a severe test to the urban natural gas strategic security.

但是，不断增长的用气需求与城市气源总量和调峰能力不足的矛盾，还是给城市天然气战略安全提出了严峻的考验。

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Over the last few years, the annual number of miles driven by Americans has stayed roughly the same, but the total amount of gas we use has been going down.

WHITEHOUSE: Weekly Address: Investing in a Clean Energy Future

Though the total amount of gas hydrates possibly recoverable is not yet known, it seems safe to assume it is sufficiently large that exploiting it in its entirety would throw the climate deeply out of the safe zone, even if no other fossil fuels are burnt.

FORBES: Gamechanging Natural Gas Tech Gets Green Light

It was 25.8% of the 2011 total, however, the actual amount of gas produced has fallen steadily since 2000.

BBC: Guernsey greenhouse gas levels rise slightly