a poor hand at chess的用法和样例：
- Mr.Rayburn: I think you've got quite a hand at this teaching thing, not that I'm saying that the others had a poor hand at it, nor that they were not up to it.
- He is a poor hand at figures.
- I am a very poor hand at tennis,but I am very fond of it.
- I am a very poor hand at tennis, but I am very fond of it.