coal seam methane content

例句：

1. 1. The coal mineis located in the northwest part ofChina.
   这个煤矿位于中国西北部。
2. 2. The methane content in the coal seam isan important indicator of its quality.
   煤层中的甲烷含量是衡量其质量的重要指标。
3. 3.The methane content in the coalseam can be used to determine theamount of natural gas that can be extractedfrom the mine.
   煤层中的甲烷含量可以用来确定从矿井中可以提取到的天然气的数量。