critical situation
临界情况
Japanese officials continued their battle to keep damaged nuclear reactorsfrom meltdowns,saying two have experienced a critical situation where theirfuel rods were damaged in overheated reactors.
日本官员继续奋力避免受损的核反应堆发生熔解,他们说两座核反应堆的情况危急,过热反应堆中的燃料棒受损.