round-trip的用法和样例：
词汇搭配
- round-trip ticket 往返票
- round trip echoes 往复回波
- round-trip lease 往返租赁
- round trip delay time 环程延迟时间...
- round trip propagation time 往返传播时间...
- round trip cycle 往返周期,往返行程时...
- round trip delay 往返行程时延...
- round trip transmission delay 往返传输时延...
- round trip 往返旅行
- round trip lease 往返程租赁
- echo round trip delay 回声往返时延...
- round trip echo 多次反射回波...
- round trip transmission [计] 往返传输...
- round-trip fare 周游票价; 来回票价...
