a wrist watch的用法和样例：
- The boy knocked off a wrist watch.
- He was unable to name a wrist watch.
- I know the idea seems strange, but I also know that it just so happens to be true: A wrist watch saved Harold Click.
- Some gestures come directly to the point, such as touching a wrist watch or cupping a hand behind the ear as signals to a speaker, or holding the nose as a reaction to an idea.
- You still owe me a wrist watch.