a lull in the conversation的用法和样例：
- Jean waited for a lull in the shop talk before attempting to return the conversation to personal concerns.
- For a space there was a lull in the AchehJohore struggle.
- I filled in a gap in the conversation by telling a joke.
- During a lull in the fighting the Mobile Units can work at the Base Hospitals.
- There was a lull in the fighting before the army crossed the Yangtze.