名词甲烷，沼气
1. 沼气：fired heater 火焰加热器 | firedamp 沼气 | firehouse 消防站
2. 坑气：fire shrinkage 焙烧收缩 | firedamp 坑气 | fireproof 耐火的
3. 甲烷：firecracker 爆竹 | firedamp 甲烷 | firedog 柴架
4. 爆炸性矿井瓦斯：firecrackerwelding 躺焊 | firedamp 爆炸性矿井瓦斯 | firedamp 爆炸性气体
noun
1. a mixture of gases (mostly methane) that form in coal mines and become explosive when mixed with air