unexpectedly - arising public accident

• 突发公共事件

unexpectedly - arising public accident的用法和样例：

例句

1. Define a public event member in your class.
   在类中定义公共事件成员。
2. In recent years, frequent emergent public incidents add to cooperation between China and ASEAN.
   近年来频繁发生的突发公共事件使中国与东盟的合作增加了新的内容。