a screen actor的用法和样例：
- A screen actor,performance,writer
- This is a screen saver of the actor, Colin Firth.
- Her mother helped her secure a Screen Actors Guild card under her maiden name Ryan and Meg was subsequently able to pay her tuition in large part with the money she earned from appearances in television commercials.
- His job at the bank was just a screen for his life as a spy.
- They put a screen around his bed so that the doctor could examine him.