a dispute unexpectedly broke out的用法和样例：
- A dispute over control of the waterway between Iraq and Iran broke out into open fighting in 1980 and continued until 1988,when they accepted a UN cease-fire resolution.
- Starting a quarrel is like breaching a dam; so drop the matter before a dispute breaks out.
- A fire broke out during the midnight.
- A quarrel broke out between them.
- The students broke out in a riot of laughter.