bird of passage

剑桥词典

UK
a bird that migrates (= moves from one area to another when the season changes )
候鳥

a person who stays for only a short period of time in one place , job , etc.
漂泊不定的人；過客
At present the organization has to rely on young , inexperienced graduates who are usually birds of passage . 目前該機搆不得不依賴沒有經騐的年輕畢業生，可這些人通常會跳槽。 返回 bird of passage