a watch of good quality的用法和样例：
- He bought his wife a watch of good quality.
- A watch of good quality is more expensive than a watch of poor quality.
- Surely I will, as long as it's of good quality.
- If your equipment is of good quality, and we receive a favourable offer, we may be able to place large orders with you.
- All my stock is of good quality: it will look good, and it will wear well.