Haveyouevergonetravelingonthetrainthatwasnamedafterthel...
问题详情：HaveyouevergonetravelingonthetrainthatwasnamedaftertheletterD?NamedaftertheletterD,thenewtrainsrunatspeedsof200to250kilometersonehour.ThesearemuchfasterthanZ-typeandT-typetrains.Forexample,itu...