One of the most awe-inspiring features of Craters of the Moon is the series of lava tubes.

对月球陨石坑的最威风的特点之一就是熔岩管系列。

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Lava tubes serve as underground pipelines, allowing molten rock to flow under and away from volcanoes.

溶洞像一个底下管道使熔融岩石从火山下端流走。

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But on the moon such geologic features usually occur following collapses of lava tubes, which formed long ago in the moon's history.

但是在月球上，这些地质特征却往往是伴随着熔岩管(很久以前就已经出现在月球上了)崩塌而出现的。

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Fossil skeletons found in lava tubes on the island, though, show that the nene was not originally alone.

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"The terrain where we were working was really dramatic, with all kinds of lava tubes and crevices, " said Phoenix business-development manager Pete LeHardy in Largo, Md.

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