This is the 2582nd most frequent Japanese word.
崔
崔 is a rare Japanese kanji primarily used for names and means "high" or "lofty."
In this sentence, "崔" is used as a family name, introducing someone who is knowledgeable about a topic.
崔先生は中国文化について詳しいです。
Mr. Cui is knowledgeable about Chinese culture.
Here "崔" again serves as a family name, showing interactions with a person identified by this name.
彼女は崔さんにメールを送りました。
She sent an email to Ms. Cui.
"崔" is referenced as part of a proper noun to describe an individual's name in a generic context.