a throwaway line的用法和样例：
- It takes a certain nerve for a comedian to try a throwaway line.
- Some people overreacted to what was only a throwaway remark.
- She was very upset at what to him was just a throwaway remark.
- Avoid throwaway test cases unless the program is truly a throwaway program.
- The small intestine is a throwaway product from pork production,and a single pig can donate up to 90 feet of it.