a man of letters的用法和样例：
- He said that he was a man of letters.
- He was a man of letters and rather learned.
- He was a man of letters with no interest in current affairs.
- Mr Miller gave up his career as a doctor to become a man of letters.
- A man of great ability like him will eventually reach the top.
- Tao Yuanming was a man of letters and refined scholar in ancient times.