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| 71. | burrel gas detector |
| 少量沼气检定器 |
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| 72. | methane series |
| 【化】甲烷系 |
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| 73. | So if more carbon is tied up in making grain, there's less in the soil, which means less methane. |
| 所以如果炭在生产稻米的时候用的越多，流失到土壤里的就会越少，也就是说产生更少的沼气。 |
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| 74. | methane-rich gas |
| 甲烷富气 |
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| 75. | The lakes, which are formed by melting permafrost as temperatures rise, have long been known to emit methane |
| 这些湖泊是由于温度升高造成永冻土融化后形成的，很久前就知道它们能释放沼气，而沼气的温室效应比二氧化碳更严重，但一直以来难以确切知道释放的数量。 |
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| 76. | limit of flammability |
| 沼气成分燃烧极限 |
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| 77. | acoustic methanometer |
| 发声沼气检定仪 |
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| 78. | methane-producing bacteria |
| 产甲烷细菌 |
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| 79. | automatic firedamp detector |
| 自动沼气检定器 |
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| 80. | methane-utilizing bacteria |
| 甲烷利用细菌 |
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