noun ダウンロード 🔗共有 石油 A flammable liquid ranging in color from clear to very dark brown and black, consisting mainly of hydrocarbons, occurring naturally in deposits under the Earth's surface Examples : "The factory used petroleum to fuel its machinery. " その工場は機械の燃料に石油を使用しました。 material substance energy fuel geology chemistry AIとチャット語彙ゲーム読解練習