Haveyouevergonetravelingonthetrainthatwasnamedafterthel...
問題詳情：HaveyouevergonetravelingonthetrainthatwasnamedaftertheletterD?NamedaftertheletterD,thenewtrainsrunatspeedsof200to250kilometersonehour.ThesearemuchfasterthanZ-typeandT-typetrains.Forexample,itu...