知道的英文

　　例句

　　1.I don't know the name of that place.

　　我不知道那个地方的名字。

　　2.Frank was a friend of mine.I'd known him for nine years.

　　弗兰克是我的一位朋友。我和他认识9年了。

　　3.We have heard about this, but the details are not very clear.

　　我们听说过这件事，但对详情不是很清楚。