N-COUNT （发表于报刊上、通常旨在抗议或评论某事的）公开信 An open letter is a letter that is published in a newspaper or magazine. It is addressed to a particular person but is intended for the general reader, usually in order to protest or give an opinion about something. （发表于报刊上、通常旨在抗议或评论某事的）公开信