bird of passage

劍橋詞典

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

a person who stays for only a short period of time in one place , job , etc.
漂泊不定的人；過(guò)客
At present the organization has to rely on young , inexperienced graduates who are usually birds of passage . 目前該機(jī)搆不得不依賴沒(méi)有經(jīng)騐的年輕畢業(yè)生，可這些人通常會(huì)跳槽。 返回 bird of passage