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1·It's not known who planted the bomb.

不知是谁放置了这颗炸弹。《柯林斯英汉双解大词典》

2·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。《柯林斯英汉双解大词典》

3·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。《柯林斯英汉双解大词典》

4·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。

5·She had not known before that this was one of the things which made her feel sour and cross.

她以前不知道这是使她感到酸楚和生气的事情之一。

6·My impatience with the customs ritual indicated that Chloe, who I had not known existed a few hours ago, had already acquired the status of a craving.

我对海关例行公事的不耐烦暗示着，几小时前我还不知道存在的克洛艾，已经产生了渴望的状态。

7·It was not known, however, whether central fatigue might also affect motor systems not directly involved in the exercise itself, such as those that move the eyes.

然而，目前人们还不清楚，中枢疲劳是否会影响与运动本身没有直接关系的运动系统，比如控制眼动的系统。

8·It is not known what causes the disease.

这种病的起因不明。《牛津词典》

9·Velvet as a fabric is not known for its versatility.

天鹅绒作为一种织物并非以其用途广泛而闻名。《柯林斯英汉双解大词典》

10·As yet it is not known whether the crash was the result of an accident.

迄今尚不知该撞击是否是由于一起事故。《柯林斯英汉双解大词典》