a crusty old soldier的用法和样例：
- He's a crusty old gentleman who feeds stray dogs and cats.
- A crusty old codger, sitting near by, seemed disturbed; at least, he stared in a most pointed way.
- Millin was a crusty old codger who took the college job after he retired from the navy.
- Huntington's last book earned him a reputation as a crusty old reactionary.He certainly became a hate figure to the left and a hero to many conservatives.