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Be familiar with sth/sb
（某人）很了解某人/通晓某件事情
to know something or someone well
John is very familiar with software development. He’s been working in IT for 20 years.
John很了解软件开发。他做IT已经有20年了。
I am not very familiar with Han. We’ve just met once.
我对Han不是太了解。我们只见过一次。

Know 认识(程度可深可浅)
Do you know Penny (well)?
你认识Penny吗？

Acknowledge
(通过招手、微笑等) 打招呼/示意
I was standing right next to her, but she didn't even acknowledge me.
我就站在她身边，但她根本就没有向我打招呼。

Be familiar to sb
(某事)对某人来讲熟悉
似曾相识/见过/听过/闻过
The name of the restaurant was not familiar to me.
I didn't know the name of the restaurant.
这个餐馆的名字我没听过。

Acquaintance /əˈkweɪntəns/ n.
泛泛之交；熟人
I heard about the job through a mutual acquaintance.
我是从一个朋友的熟人那了解到这个工作机会的。

今日挑战
选词填空，将正确答案写在留言处
并翻译句子和大家分享
I recently met an old work acquaintance of ___ and I hardly recognized him.
A. me
B. mine
C. I
D. my