a run-of-the-mill job的用法和样例：
- There has been a run of rainy days since Monday.
- Catching sight of the dog, he broke into a run.
- There has been a run of rainy day since Monday.
- College students have the run of the university library.
- This play has had a run of over ten performances.
- The train makes a run of 100 miles in 2 hours.