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你是否听过这句英文 "People come and go."
意思就是——人来人往，表达人生中的过客短暂出现又离开了。其中使用到的片语「come and go」意旨「来来去去、时有时无」，可以用来描述某人事物的短暂存在与变动。
 

come and go (phr.) 来来去去、时有时无

例句：
 
Friends may come and go, but family stays.
 
Tom noticed that the pain in his leg would come and go, but it never lasted long.