dropped in on

• v. 非正式访问(顺便来访)

dropped in on的用法和样例：

例句

1. He dropped in on us last Sunday.
   上星期天他来看我们了。
2. He dropped in on us occasionally.
   他不时来我这儿坐坐。
3. I dropped in on him yesterday.
   我昨日去看过他。