The intensely critical spirit is often the narrow-minded and ignorant one.

　　極愛吹毛求疵的人往往是心胸狹窄和無知的人。

　　An ignorant person can be dangerous.

　　無知的`人可能是危險的。

　　At that time I was ignorant of events going on elsewhere.

　　那時我并不了解其他地方發生的事情。

　　Never make your students feel ignorant.

　　千萬別讓你的學生感到自己一無所知。

　　He's ignorant about modern technology.

　　他對現代科技一無所知。