We saw the visitors off at the bus stop.

我们把客人送到汽车站。

　　see off：go to say or wave goodbye to sb．upon his departure 为…送行
　　再如:
　　Wives used to see their husbands off to work at the front door，but this is no longer common．
　　妻子们过去习惯在门口目送丈夫们去上班，这在现在已不常见了。