In my experience, very few people really understand the problem.

　　據我的經驗看，真正理解這個問題的人很少。

　　I quite understand that you need some time alone.

　　我很理解你需要獨自靜一會。

　　People are often afraid of things they don't understand.

　　人往往對自己不懂的東西感到恐懼。

　　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.

　　委員會對這個問題了解不多或根本不了解。