a second pair的用法和样例：
- You will need a second pair of shoes.
- She is looking for a second pair of shoes.
- I keep a second pair of sandals in my office.
- I wouldn't hesitate to bring it along as a second pair of pants if inclement weather is expected.
- The second pair is a better fit, but he does not like the colour.
a second pair的相关资料：