[xiāng shí]
(彼此认识) be acquainted with each other
have never met; not be acquainted with each other
素不相识
We are the casual acquaintances of a long railway journey.
我们是在火车长途旅行中相识的朋友。
pick up an acquaintance with sb.
(和偶然碰到的人)结为相识
an old acquaintance
老相识