urgent ; critical

• 紧急通知

  urgent notice

• 紧急会议

  emergency meeting

• 紧急任务

  emergency mission

• 紧急关头

  critical moment

• 发表紧急声明

  make an emergency announcement

• 采取紧急措施

  take emergency measures

• 战事紧急

  military emergency

• 前线紧急

  frontline emergency

• 风声紧急

  extremely tense situation

• 想必是有了什么紧急的事情。

  Presumably there was an urgent incident.