familiar

adj.熟悉的, 常见的, 听惯的, 亲近的, 随便的

n.密友, 熟客, 常客

1、（常与to连用）熟悉的；常见的；普通的

a familiar sight

常见的情况

This song sounds familiar.

这首歌听起来很熟

sth be familar to sb. 某件事物对于某人来说很熟悉

The voice is familiar to him.

2、（常与with连用）熟悉…的；通晓…的

Are you familiar with this type of car?

你熟悉这种型号的汽车吗？

Are you familiar with the rules of baseball?

你熟悉棒球规则吗?

He is familiar with that book.

他熟悉该书。

He is familiar with Chinese ancient history.

他通晓中国古代史。