沼しょう気きしょうきじ字FuriganaMeanings1nounmarsh gas; methaneTechnical term for methane, especially as produced by decaying organic matter in marshes.沼しょう気きは湿しっ地ち帯たいで自し然ぜんに発はっ生せいする可か燃ねん性せいのガスです。Marsh gas is a flammable gas that occurs naturally in wetlands.
