为此事往返奔走
rush back and forth in aid of it
徒劳往返
hurry back and forth for nothing
往返共５公里。
Five kilometres there and back.
往返票价６元。
The return fare is six RMB.
公共汽车每日往返八次。
The bus makes eight round trips every day.
到那里往返只要一天。
It only takes a day to get there and back.
上海和青岛之间有轮船往返。
Passenger ships travel between Shanghai and Qingdao.