硬火山石显然有一个可靠的市场。

The hard volcanic stone apparently had a secure market.

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这些探测器还让科学家们认为，在木卫二的表面之下，有一个释放出火山的热量的岩石内核。

The probes have also made the scientists think that under its surface, Europa has a rocky core giving off volcanic heat.

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世界上很少火山有详细记录的的火山爆发史。

Few volcanoes in the world have an eruption history so thoroughly documented by historical records.

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