a pair of dice的用法和样例：
- I bought a pair of tan leather shoes the other day.
- Then he found some colored buttons for tokens, a pair of dice, and lots of play money.
- Billy has a pair of new trousers.
- This small animal has a pair of hazel eyes.
- He was dressed in a pair of black trousers.
- The young girl has a pair of almond eyes.