a master hand的用法和样例：
- The sculpture of a group of heroes in the centre of the city square shows a master hand.
- This painting is the work of a master hand, ie a superior and skilful artist.
- They could then hear distinctly from the corridor the sounds of the balalaika, unmistakably played by a master hand.
- The picture showed the hand of a master.
- A great poet is a master melody.