sudden outbreak 突然爆发
break out 爆发
outbreak of war 战争爆发
A: Has the virus outbroken in the city?
A：该城市病毒爆发了吗？
B: Yes, it has outbroken in many districts.
B: 是的，它已经在许多地区爆发了。
1) 非标准词汇，指代爆发状态
2) 类似于 broken out 的用法
1. 爆发的（非标准用法）
adjective
1. Having broken out or occurred suddenly (non-standard).
Synonym: erupted, occurred