a pair of pliers的用法和样例：
- I need a hammer and a pair of pliers.
- I bought a pair of tan leather shoes the other day.
- But rather a large pair of pliers.
- He had a coil of wire around one arm and a pair of pliers hung by a thong from his wrist.
- Have you got a pair of pliers?
- Billy has a pair of new trousers.