a friendship of many years的用法和样例：
- a friendship of many years' standing
- Drunk friends embarrassed about the causes of drunkenness: "I am a friend of more than 50, single for many years, always wanted to have a wife, but did not succeed each other many times before.
- A friend of mine has been for many years not much in favor of welfare program.
- They have had a friendship of ten years.