It's not known who planted the bomb.

不知是谁放置了这颗炸弹。

It's still not known how many died in the volleys of gunfire.

尚不知道有多少人死于齐发的炮火中。

Marianne had not known until Arnold primed her for her duties that she was to be the sole female.

直到阿诺德向她交待她的职责时，玛丽安娜才知道她将是惟一的女性。

As if she had not known she were going to say it.

好像连她自己也不知道她要这么说似的。

I am sure you believe me when I tell you that I have not known any real joy for years.

当我告诉你，我多年来都不知道什么是真正的快乐时，我知道你相信我。