bird of pas·sage
noun/ˌbɜːd əv ˈpæsɪdʒ/
/ˌbɜːrd əv ˈpæsɪdʒ/
(plural birds of passage)
- a bird that travels regularly from one part of the world to another at different seasons of the year
候鸟 - a person who passes through a place without staying there long
过客