Active service contracts on file的用法和样例：
- The Unit shall keep terminated labor contracts on file for no less than two years for record keeping purposes.
- He was disabled when on active service.
- NSN has more than 200 managed service contracts on five continents.It is monitoring more than 125,000 base stations, and it brings a new base station on air every 10 minutes.
- She has been on active service for ten years.
- We have all your particulars on file.