往来

例句：

1. 1. Weoften exchange letters and emails with our friendsin different countries.
   我们经常与不同国家的友人交换信件和电子邮件。
2. 2. Thebusinessman frequently visits hisclients in different cities.
   这位商人经常访问他的客户位于不同的城市。
3. 3.They have been exchanging ideas and opinionsfor several years now.
   他们已经交流想法和观点好几年了。