"Round-trip ticket" 是往返票的英文短语。"Round-trip" 意为 "往返"，"ticket" 意为 "票"。它来源于英语中 "round" 和 "trip" 的组合，"round" 意为 "环形"，"trip" 意为 "旅行"。
例句:
I bought a round-trip ticket to New York. (我买了一张往返纽约的票。)
Can you please get me a round-trip ticket for this weekend? (请问你能帮我买一张这个周末的往返票吗？)
I'm planning to take a round-trip to Tokyo next month. (我打算下个月去东京旅游。)