柯林斯詞典methane /?mi?θe?n/ 1. N-UNCOUNT Methane is a colourless gas that has no smell. Natural gas consists mostly of methane. 甲烷 返回 methane劍橋詞典a gas with no smell or colour , often used as a fuel 甲烷，沼氣 Methane is the main constituent of natural gas . 甲烷是天然氣的主要成分。 返回 methane