a need for improvement的用法和样例：
- There is a need for greater unity in the party.
- There is need for improvement in your handwriting.
- Crops in need of water; a need for affection.
- To the extent that there is a need for improvement, it should make more transparent the division of the functions and responsibilities between the two.
- There is a need for a curb on downloading papers.
- There is a need for the conservation of trees.