methane

詳細解釋：

meth.ane

n.（名詞）
An odorless, colorless, flammable gas, CH4, the major constituent of natural gas, that is used as a fuel and is an important source of hydrogen and a wide variety of organic compounds.
甲烷：一種無味，無色，易燃汽體，CH4，是天然氣的主要組成部分，被用作燃料，是氫和其它多種有機化合物的重要來源