act as a go-between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.
- He acted as a middleman in discussions between the two companies.
- 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.