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| 71. | A combustible gas, chiefly methane, occurring naturally in mines from the decomposition of coal. |
| 沼气一种在矿坑里由煤腐烂而自然产生的可燃气体，主要成分是甲烷 |
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| 72. | fresh water marsh |
| 淡水沼泽 |
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| 73. | marsh mallow root |
| 药用蜀葵根 |
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| 74. | salt marsh ecology |
| 盐沼生态 |
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| 75. | Marsh-Berzelius test |
| 马什－伯齐利厄斯试验 |
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| 76. | open-coast marsh |
| 开阔岸沼泽 |
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| 77. | barrier island marsh |
| 滨外岛沼泽 |
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| 78. | marsh land coast |
| 沼泽海岸 |
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| 79. | The marsh marigold. |
| 驴蹄草一种驴蹄草属植物 |
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| 80. | Marsh funnel viscosity |
| 马氏漏斗粘度 |
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