According to this definition, one species is distinguished from another by the possibility of matings between individuals from each species to produce fertile offspring.

根据这一定义，区分不同物种的标准是不同物种的个体间相互交配产生可育后代的可能性。

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But the offspring is unlikely to be fertile.

不过他们的后代不大可能有繁殖能力。

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“It is likely that perfect 0.7 ratio sends a biological signal to men that that woman is most fertile and most likely to produce a healthy offspring, no matter what size that woman is, ” he said.

他说“有可能完美的0.7比例向男性传递着一种生理信号，无论该女性的整体尺寸如何，0.7的比例意味着女性的生育能力更强，更容易产下健康的后代。”

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Species are things that interbreed and have fertile offspring.

BBC: So we're part Neanderthal. What now?

These eggs were then transplanted into a female mouse and healthy offspring were born who grew into fertile male and female adult mice.

BBC: Stem cell sperm study leads to successful mouse births