methane coefficient

例句：

1. 1. The methanecoefficient is a key factor in determining theefficiency of a gas engine.
   甲烷系数是决定气体发动机效率的关键因素。
2. 2. The methane coefficient is used to calculate theamount of methane produced by aparticular source.
   甲烷系数用于计算特定来源产生的甲烷量。
3. 3. The methane coefficientis an important indicator of environmental sustainability.
   甲烷系数是衡量环境可持续性的重要指标。