familiar/fəˈmɪlɪə(r)/
adj.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.这首歌听起来很熟悉。
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。
3. 非正式的；通俗的He wrote in a familiar style.他以通俗的风格写作。
4. 过分亲密的；放肆的That guy's unpleasant familiar behaviour angered the girls.那个家伙令人不悦的过分亲昵行为使姑娘们很生气。