a second pair的用法和样例：
- You will need a second pair of shoes.
- I keep a second pair of sandals in my office.
- I really must buy a second pair of shoes; and the next year shall do my best to buy a third.
- 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：
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