2 sentences for 來回 (lái​huí — make a round trip)

1. 我们在公园里来来回回地走了2小时。

   wǒ​men zài gōng​yuán li lái​lái​huí​huí de zǒu le2 xiǎo​shí.

   We walked back and forth in the park for two hours.

   Source: UM-Corpus: Spoken

2. 我们来来回回聊了几分钟，她则继续看似忙碌。

   wǒ​men lái​lái​huí​huí liáo le jǐ fēn​zhōng, tā zé jì​xù kàn​sì máng​lù.

   We chatted back and forth for a few minutes as she continued to look busy.

   Source: CCMatrix