In reality, if you look at our population strategy research report, the birth rate should be kept at about 1.8. Anything higher or lower would be disadvantageous.

实际上，你看我们的人口战略研究报告，生育率应该保持在1.8左右，过高或者过低都不利。

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This strategy is feasible when you have a small population.

这种策略在人口较少的情况下是可行的。

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A common strategy is to posit some externalcause such as population growth, climate change, or a new technology, and thenshow its effect on institutions and culture.

一个通常的策略是假设一些诸如人口增长、气候变化、技术革新的外因，然后说明其对制度与文化的作用。

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She explains that the strategy did not work as predicted because of what's called a population level effect.

VOA: standard.2010.03.22

"When you can't say for sure whether all the women in the advance provision group actually used the medication, then you're kind of looking at population level effect of a strategy, not the individual effect of a medication."

VOA: standard.2010.03.22

The researchers calculated that a population which followed a Nash strategy would contract 100 times more infections than one which followed a utilitarian strategy.

ECONOMIST: Flu vaccination

The current strategy depends on the prison population remaining stable, but this is something over which it NOMS has no control, Mrs Hodge said.

BBC: Prison cuts may see reoffending rise, say MPs

Dr Boyd showed that when punishers were introduced to the mix, even if they started in only one group, their strategy spread rapidly through the population.

ECONOMIST: The evolution of punishment explained