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。

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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。

youdao