The intensely critical spirit is often the narrow-minded and ignorant one.
极爱吹毛求疵的`人往往是心胸狭窄和无知的人。
An ignorant person can be dangerous.
无知的人可能是危险的。
At that time I was ignorant of events going on elsewhere.
那时我并不了解其他地方发生的事情。
Never make your students feel ignorant.
千万别让你的学生感到自己一无所知。
He's ignorant about modern technology.
他对现代科技一无所知。