They assumed some instinct would lead women to keep having enoughchildren to ensure the survival of the species.

他们设想某种本能会促使妇女们继续生孩子，达到足以保证这个物种生存下去的数量。

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Ottawa authorizes the slaughter of 338, 000 seals per season, and says the survival of the species is not in danger.

渥太华规定，每季可以杀死33.8万海豹，并表示该物种的生存是没有危险的。

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From a biological point of view, the difference has probably evolved because women are more likely to ensure the survival of the species.

从生物学角度来说，这种差异的演化可能是出于女性更有可能确保种族生存。

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He says the impact of international trade is negligible for the survival of the species.

BBC: Polar bear trade ban 'too close to call'

Gallagher says competition is biological, hardwired into humans in order to ensure the survival of the species.

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Negotiators are split on the plan, with those in favour saying it is crucial for the survival of the species.

BBC: Polar bear trade ban 'too close to call'