I can't believe you'd tell a total stranger about it!

我不能相信你会把这事告诉一个素昧平生的人！

《牛津词典》

Give a smile to a total stranger on the street.

在街上给完全不认识的人一个微笑吧。

youdao

The man is a total stranger to me.

那人对我来说完全是个陌生人。

youdao

The other day, I accidentally approved a request from a total stranger who offered no explanation of why he wanted to connect.

FORBES: LinkedIn's Sneaky Social Engineering

Once a total stranger called them from Hightown Plaza.

NEWYORKER: Puppy

The fact that so many people, to whom I am a total stranger, took the time to elect me as their contestant of choice is something I am still trying to comprehend.

CNN: Miss Montana: Autism doesn't define me