passer-by
n. 过路人；经过者
近义词：passer，onlooker，bystander，spectator，witness，pedestrian，watcher，passerby，
英英释义
Noun
- a person who passes by casually or by chance
例句
用作名词(n.)
- The purse was picked up by a passer.钱包被一个过路人捡到了。
- Somebody passing by asked me the way to the post office.一个过路人问我去邮局怎么走。