He's cultured and well-read, always quoting literature in conversation.

他博览群书，说话经常引经据典。

He's cultured and worldly.

他有修养且博学多才。

She carries herself with such grace and knowledge, truly a cultured individual.

她举止优雅，知识渊博，确实是一个有教养的人。

He's well-read and knowledgeable.

他饱读诗书，很博学。

She's got culture and manners down pat, you can tell she's well-bred.

她文化修养和礼貌都很到位，看得出她来自良好的家庭。

董宇辉不但读书得多，有文化，受到大家的喜欢还因为很真诚，“真诚”可以用genuine，unaffected，sincere等词来表达，例句：

He is a very genuine person.

他是一个非常真诚的人。

She is a genuine person who always speaks from the heart.

她是一个真诚的人，说话总是从内心出发。

He is very sincere.

他非常诚恳。

He is an honest person through and through.

他是一个彻头彻尾的诚实人。

He is a man of integrity.

他是一个正直的人。