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

參考例句：
  • The wave is to reinforce itself after one round trip.
    在一個往返行程之后，波浪加強了其自身的力量。
  • Ferryboats ply across the English Channel.
    渡船定期往返于英吉利海峽。
  • I'll take the round-trip ticket, please.
    我要買往返的車票。
  • The price is 20 yuan for a return ticket.
    往返票價是二十元。
  • Ferries that ply between England and France
    往返英法間的渡輪
  • Travelling backwards and forwards between London and the south coast
    往返于倫敦和南海岸之間
  • "Shuttle, Rotation Injection Heading Machine"
    往返、旋轉式注塑打頭機
  • Two small boats ferry people back and forth.
    兩只小船往返為人擺渡。
  • A courtesy shuttle bus operates between the hotel and the town.
    有免費班車往返于酒店和市區(qū)。
  • Buses ply between the two cities.
    公車定期往返于那兩個城市之間。
back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后衛(wèi)
v. 支持；后退，倒退；背書；下賭注于
adj. 背部的；后面的；過去的；拖欠的.
adv. 以前；向后地；來回地；上溯
  • Stand back to back!
    背靠背站好！
  • They are on the back of the menu.
    它們在菜單背面。
  • Our seats on the train were back to back.
    我們在火車上的坐位是背靠背的。
forth是什么意思：
adv. 向前，往外；（從...）以后
  • The forth day, the miracle seems hold forth.
    第四天，奇跡似乎發(fā)生了。
  • A great epidemic burst forth.
    突然發(fā)生了一場大瘟疫。
  • The tree branches forth in spring.
    春天樹木抽出新枝。
fro是什么意思：
ad. 向后,向那邊
  • The ship was rolling heavily to and fro.
    輪船劇烈地顛簸。
  • He was bowing to and fro.
    他一個勁兒地點頭哈腰。
  • The tall chimney tottered(to and fro) and then collapsed.
    那座高煙囪搖搖晃晃地倒了下來.

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