# methane ##### 词义 - 英：/ˈmiːθeɪn/； 美：/ˈmeθeɪn/ - #词性/n 甲烷；沼气 ##### 例句 - Methane and propane are alkanes . - 甲烷和丙烷是烷烃。 - Methane is often regarded as the second most important greenhouse gas after carbon dioxide . - 甲烷常被认为是仅次于二氧化碳的重要温室气体。 - As the waste materials decompose , they produce methane gas . - 废物腐烂时会产生沼气。