a casual acquaintance
英 美
She was a casual acquaintance in Vienna.
她是我在越南的一个熟人。
He described himself as a casual acquaintance of the Kennedys'.
他称自己是肯尼迪夫妇的泛泛之交。
Even a casual acquaintance or a stranger may have a deep impact on our lives.
甚至一个偶然的路人或一个陌生人可能都对我们的一生有重大的影响。