Thetimemaysooncomewhenwesaygoodbyetomostoftheworld’sl...
问题详情： Thetimemaysooncomewhenwesaygoodbyetomostoftheworld’slanguages.Todayhumansexpressthemselvesinover6,000differentlanguages.Butthatisquicklychanging.Manyscientistssaythatoverhalfoftheselangua...