noun ダウンロード 🔗共有 飛行機雲 An artificial cloud made by the exhaust of jet aircraft or wingtip vortices that precipitate a stream of tiny ice crystals in moist, frigid upper air. Examples : "The airplane's contrail stretched across the sky, a thin white line marking its path. " 飛行機の飛行機雲が空を横切り、その進路を示す細い白い線を描いた。 weather environment science physics technical AIとチャット語彙ゲーム読解練習