In my experience, very few people really understand the problem.
据我的经验看，真正理解这个问题的人很少。
I quite understand that you need some time alone.
我很理解你需要独自静一会。
People are often afraid of things they don't understand.
人往往对自己不懂的东西感到恐惧。
She doesn't understand the difference between right and wrong.
她不能明辨是非。
The committee has little or no understanding of the problem.
委员会对这个问题了解不多或根本不了解。