重じゅう要よう産さん業ぎょうじゅうようさんぎょうMeanings1nounkey industry; important industryRefers to an industry that is vital to a country's economy or security, such as energy, defense, or food production.エネルギーは国くにの重じゅう要よう産さん業ぎょうの一ひとつです。Energy is one of the country's key industries.
