a Polaroid picture的用法和样例：
- This is an experience so raw and visceral that your participant begins to shake like a Polaroid picture.
- I'd like to buy a Polaroid camera.
- I don't think I'll need a Polaroid.
- I have been waiting for a beautiful morning to take a Polaroid of it.
- The Polaroid pictures of Betty he carries begin to have a special, almost hypnotic power for him.