a long-wave broadcast的用法和样例：
- A long wave on water that moves continuously without breaking.
- A long wave that has reached its peak or broken into foam; a breaker.
- There was a long lag in forwarding mail to us.
- Radio2 can be heard on the long wave band.
- Fruit juices ferment if they are kept a long time.
- The beggar spun a long yarn about his misfortunes.