Take challenging composition courses (not just creative writing courses, but classes in journalism, technical writing, etc.) so that you can "speak" journalese, UNese, legalese, etc.

修习高级作文课程（不是创意写作课，而是像新闻写作，技术文件写作等等），这样才能说得像记者，像联合国人员，像律师等。