round-the-world trip环球旅行
a round-the-world tour环球旅行;环球旅游
backward round-the-world echo[物] 反向环球回波
a round-the-world flight环球飞行
round-the-world-trip环球旅行
Round-the-world racing bicycle环球赛车
Round-the-World Tickets环球机票
Round-the-World Fares自出发地点向东或西继续旅行而最后返抵原出发点的环球票价
round - the -world cruise环球航行