Their high reproductive rate helps the nunas avoid extinction.

高繁殖率有助于努纳免遭灭绝。

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Urbanization in Spain is distinctly correlated with a fall in reproductive rate.

西班牙都市化进程的加快很明显和该国的出生率下降有关。

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Objective To compare the effects of colony oviposition and single tube oviposition for improving the reproductive rate of Anopheles anthropophagus .

目的比较群体产卵法与单管产卵法对提高嗜人按蚊繁殖率的效果。

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Polar bears are a long-lived species with a low reproductive rate, so recovery from overharvesting could take many decades.

ECONOMIST: A clash between environmentalists and Inuit rights

Whale researchers use population models that factor a species' reproductive rate and its natural mortality to come up with an estimate of how many are likely dying.

MSN: Feds to reroute SF Bay ships to protect whales

Because of illiteracy, women face major socioeconomic challenges including high risks with regard to reproductive health with reports suggesting that the maternal mortality rate in the country is among the highest in the world.

UNESCO: Learning for Life