据研究人员介绍，就如此细小的现象做成像和比较的病原体研究也还是头一回。

The plague studies marked the first time such small events have been imaged and compared, the researchers said.

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据NASA表示，这些冰层比较纯净，而且至少有几英尺厚才能得到这样的反馈信号。

According to NASA, the ice would have to berelatively pure ice and at least several feet thick to give this signature.

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据披露，易卜拉欣正是这位摄影者，考虑到，那时利比亚还是个国际上比较穷的国家，这种潜在影响很严重。

Ibrahim, it transpired, was the culprit - and given that Libya was still, at the time, an international pariah, the ramifications were potentially serious.

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