太空探测器提供的证据表明，木卫二表面下有一个巨大的海洋。
Space probes have provided evidence that Europa has a large ocean under its surface.
杨说，冰川作用在地球的整个发展历史中都有发生，有证据表明它发生在二叠纪末期。
Glaciation, Young claims, has occurred throughout Earth's history, and there is evidence that it occurred toward the end off the Permian period.
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