只有约百分之五的哺乳动物是单一配偶的。
像大多说动物一样，果蝇必须区分潜在的配偶和潜在的敌人。
Like most animals, fruit flies must distinguish between a potential mate and a potential competitor.
像大多说动物一样，果蝇必须区分潜在的配偶和潜在的敌人。
Like most animals, fruit flies must distinguish between a potential mate and a potential competitor.
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