【经】 往返一次, 起下钻一次
在线英汉词典
round trip的短语、例句：
round trip (a) journey to one or more places and back again, often by a different route 环程旅行（常不循原路线返回）. (b) (US) = return2 5
[attrib 作定语] a ,round-trip `ticket 一张往返票.

标签：round trip,用法,音标,短语