①The tough new law should act as a deterrent.
②Women should be free to dress and act as they please
①do the work of；serve as当作；充当
A trained dog can act as a guide to a blind person．
This kind of tea act as an aid to digestion．
②play the role of担任…的角色
One of his friends acted as the gobetween．
act as 与act for的用法区别
①act as (临时)担任,充当,起……的作用
A trained dog can act as a guide to a blind person.
He acted as manager in my absence.
I don’t understand their language; you’ll have to act as interpreter.
②act for 代理(某人职务),代为(处理某事)
Please act for me during my absence.
I acted for our captain while he was in hospital.
act as 当任，
e.g.If there's nothing for Moscow to fear in NATO and EU expansion, its members should not act as if there is.
Note that all three types of partner can act as users of the enterprise system.
Of course, even when we act as part of a coalition, the risks of any military action will be high.