act as a matchmaker的用法和样例：
- The forest will act as a defense against desert dust.
- 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.
- I must find someone to act as a deputy for me during my absence.
- The presence of the army should act as a check on civil unrest.