passerby ['pɑ:sə'baɪ]

以下由轻松背单词网站提供

n.过路人，行人

a person who passes by casually or by chance

We had our photo taken by a passerby. 我们请了一个路人为我们照相。
A passerby heard her screams and rushed to her aid. 一个过路人听见她的尖叫，便冲过去帮助她。