age of trees的用法和样例：
- The greenwood cutting rooting effect on ground cherry shoots which were picked in different growth periods and different cultivars and age of trees were studied.
- We made camp under the shade of trees.
- The average age of the boys in this class is fifteen.
- A row of trees screened our view.
- I don't think he looks his age of seventy.
- A fringe of trees stood round the pool.