电梯井的浓烟持续冒出了15分钟，核电站被迫宣布此事为“非寻常事件”，这是紧急事件中的最低等级。
Because the incident lasted more than 15 minutes, the plant was required to declare the unusual event, the lowest level emergency.
电梯井的浓烟持续冒出了15分钟，核电站被迫宣布此事为“非寻常事件”，这是紧急事件中的最低等级。
Because the incident lasted more than 15 minutes, the plant was required to declare the unusual event, the lowest level emergency.
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