我每天来回走十公里。
wǒ měitiān láihuí zǒu shígōnglǐ 。
I walk ten kilometers back and forth every day.
他来回跑了几圈。
tā láihuí pǎo le jīquān 。
He ran a few laps back and forth.
这条路很平坦,适合来回骑自行车。
zhè tiáo lù hěn píngtǎn , shìhé láihuí qí zìxíng chē 。
This road is very flat, suitable for riding a bike back and forth.