noun 下载 🔗分享 天然气,瓦斯。 A mixture of gaseous hydrocarbons associated with petroleum deposits; mostly methane with smaller amounts of ethane, propane and butane; principally used as a fuel. Examples : "Many homes use natural gases to heat water and cook food. " 许多家庭使用天然气来烧热水和做饭。 energy fuel material geology chemistry substance environment science 与AI对话词汇游戏阅读练习