While some emergencies are self-evident (such as a natural disaster that threatens many lives), many smaller incidents require that an observer (or affected party) decide whether it qualifies as an emergency.
虽然一些紧急情况不言自明（例如威胁众多生命的自然灾害），但许多较小事件要求检查员（或受影响方）决定是否构成紧急情况。