keep in contact/touch with
continue in communication with；be in touch with 与…保持联系
Now that we've met again aftre all these years，let's keep in touch with each other．既然这么多年之后我们又见面了，那就让我们彼此保持联系吧。
When I was at college I kept in touch with my parents by phoning them every week．我上大学时，每周打一次电话和父母保持联系。