... lower bound 下界 lower central series 降中心列 lower class 下类 ...
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... 下中心链 lower control chain 下中心群列 lower central series 先导变量法 method of leading variable ...
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The Lower Carboniferous Ceshui and Upper Permian Longtan coal series are most important in Southeast China, and can both generate and bear gas greatly in the Lianyuan coal basin, Central Hunan, China.
湘中涟源煤盆地早石炭世测水组、晚二叠世龙潭组煤系是中国东南诸省境内最重要的煤系，具有较大的生气、储气能力。
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