设法描述一下就在事故发生前的确切情景。
内部记录表明，在事故发生前就已有了安全方面的担心。
The internal record indicates that there had been concern about safety before the accident.
此次核灾难是三英里岛核电站事故发生前最为严重的反应堆事故。
It would come to be known as the worst reactor accident until Three Mile Island.
此次核灾难是三英里岛核电站事故发生前最为严重的反应堆事故。
It would come to be known as the worst reactor accident until Three Mile Island.
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