passer-by

劍橋詞典

someone who is going past a particular place , especially when something unusual happens
（尤指在不尋常之事發(fā)生時經(jīng)過某処的）過路人，行人
The gunmen opened fire , killing a policeman and a passer-by. 持槍者開槍打死了一名警察和一位路人。 返回 passer-by