求翻译：来回是什么意思？

Back and forth

When I heard this message a lot more intimate, seems destined for the Lotus that is our home, and increasingly, a wide 40-meter-long more than 3 km of the lotus with the engraving has been in the Zhang Zhidong during lived in learning. This is why I should be grateful if you could have called our co

Back and forth

Back and forth

round trip;