Research suggests humans, Neanderthals interbred.
研究证实人类和尼安德特人有过杂交。
Such percentages provide clues on how modern humans migrated and interbred.
这些百分数提示了我们现代人迁移和通婚的方式。
Polar bears and brown bears became distinct species around 150, 000 years ago, but have occasionally interbred ever since.
北极熊和棕熊在大约15万年前进化为不同的物种，但是自那时起开始出现偶然的杂交。
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