Research by an international team of scientists has found that all polar bears descend from a single female brown bear.
由国际科学家组成的一支研究小组发现,所有北极熊都是一种雌性棕熊的后代。
Research by an international team of scientists has found that all polar bears descend from a single female brown bear.
由国际科学家组成的一支研究小组发现,所有北极熊都是一种雌性棕熊的后代。
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