gindexgigaton./gig-uh-tuhn, jig-/US // ˈgɪg əˌtʌn, ˈdʒɪg- //千兆吨级,千兆吨,千亿吨,十亿吨Definitionsn.noun · 名词1.›one billion tons. Abbreviation: GTLevel 3More words in g →