The 23 million-year-old creature was not a direct ancestor of today's seals, sea lions and walruses, a group known collectively as pinnipeds.
这只2300万年
并不是如今海豹、海狮和海象直系祖先，而是来自另一
支。
复数）The 23 million-year-old creature was not a direct ancestor of today's seals, sea lions and walruses, a group known collectively as pinnipeds.
这只2300万年并不是如今海豹、海狮和海象直系祖先，而是来自另一支。
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