a door-to-door salesman的用法和样例：
- A glib door to door salesman sold her a set of books that she did not want.
- A sergeant went from door to door requisitioning bullets for the men.
- The journey takes about an hour, door to door.
- He made a living by begging from door to door.
- He makes a living by begging from door to door.
- He went from door to door, selling encyclopaedias.