problem of safe的用法和样例：
- The rules of safe driving apply to everyone.
- She skirted round the problem of the high cost.
- He often came up against the problem of money.
- We are facing a problem of great complexity.
- The paper briefs the development process of fatigue design calculation,indicates the key problems of safe operation and maintenance of boiler drum.
- How do you cope with the problem of poor vision?