往返的英文：
go back and forth
go to and fro

参考例句：
  • The wave is to reinforce itself after one round trip.
    在一个往返行程之后，波浪加强了其自身的力量。
  • Ferryboats ply across the English Channel.
    渡船定期往返于英吉利海峡。
  • I'll take the round-trip ticket, please.
    我要买往返的车票。
  • The price is 20 yuan for a return ticket.
    往返票价是二十元。
  • Ferries that ply between England and France
    往返英法间的渡轮
  • Travelling backwards and forwards between London and the south coast
    往返于伦敦和南海岸之间
  • "Shuttle, Rotation Injection Heading Machine"
    往返、旋转式注塑打头机
  • Two small boats ferry people back and forth.
    两只小船往返为人摆渡。
  • A courtesy shuttle bus operates between the hotel and the town.
    有免费班车往返于酒店和市区。
  • Buses ply between the two cities.
    公车定期往返于那两个城市之间。
back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后卫
v. 支持；后退，倒退；背书；下赌注于
adj. 背部的；后面的；过去的；拖欠的.
adv. 以前；向后地；来回地；上溯
  • Stand back to back!
    背靠背站好！
  • They are on the back of the menu.
    它们在菜单背面。
  • Our seats on the train were back to back.
    我们在火车上的坐位是背靠背的。
forth是什么意思：
adv. 向前，往外；（从...）以后
  • The forth day, the miracle seems hold forth.
    第四天，奇迹似乎发生了。
  • A great epidemic burst forth.
    突然发生了一场大瘟疫。
  • The tree branches forth in spring.
    春天树木抽出新枝。
fro是什么意思：
ad. 向后,向那边
  • The ship was rolling heavily to and fro.
    轮船剧烈地颠簸。
  • He was bowing to and fro.
    他一个劲儿地点头哈腰。
  • The tall chimney tottered(to and fro) and then collapsed.
    那座高烟囱摇摇晃晃地倒了下来.

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