If someone or something is familiar to you, you recognize them or know them well.
He talked of other cultures as if they were more familiar to him than his own.
他谈起其他文化时似乎对他自己的文化还要熟悉。
They are already familiar faces on our TV screens.
他们已经是我们电视屏幕上熟悉的面孔了。
If you are familiar with something, you know or understand it well.
Most people are familiar with this figure from Wagner's opera.
多数人对瓦格纳歌剧中的这个人物是熟悉的。
If someone you do not know well behaves in a familiar way towards you, they treat you very informally in a way that you might find offensive.
It isn't appropriate for an officer to be overly familiar with an enlisted man.
军官对入伍士兵过分随便是不合适的。