a laughing jag的用法和样例：
- He told me the news with a laugh.
- Humor is often more than a laughing matter.
- It's not a good film, but it's good for a laugh.
- The funny book had a laugh on every page.
- Staggering to his feet, the drunkard bellow out a laugh.
- If you do that, you will make yourself a laughing stock.