Before the mass extinction, the top ocean predators were primitive sharks.
在大规模灭绝之前，高等海洋肉食生物是远古的鲨鱼。
Basically surface Earth is mostly ocean with a scoop of fresh water on top.
基本上可以这么说，地球表面上空是一个拥有巨量水源的大洋。
Top condition and very quite in front of ocean.
条件相当好，在海洋的面前。
Top condition and very quite in front of ocean.
条件相当好，在海洋的面前。
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