a coat pocket的用法和样例：
- Keeping an extra key in a coat pocket may assist drivers who lock their keys in their cars during a chaotic situation.
- I always have a lot of bit and pieces in my coat pocket.
- I always have a lot of bits and pieces in my coat pocket.
- He pulled a manuscript from his inside coat pocket.
- How many yards must I buy to make a coat?
- He do not wear a coat in spite of the cool weather.