a bird of passage的用法和样例：
- He was a bird of passage until he married and bought a house.
- He's a bird of passage and is only staying with us for a couple of nights on his way to America.
- An owlet is a bird of prey that flies at night.
- An archaeologist, an odd bird of passage who turns up there every three or four years or so.
- He is a young eagle, a bird of prey.