act as a broker的用法和样例：
- The role of most magazines, as seen by their owners, was to act as a broker in bringing together the buyers and sellers of goods.
- The forest will act as a defense against desert dust.
- I do not regard a broker as a member of the human race.
- Maybe I can act as a messenger for you.
- A trained dog can act as a guide to a blind person.
- Fix wages and lack of promotion act as a disincentive to employee.