New approaches are harder for countries that do not keep a central population register.

对于没有保存中央人口档案的国家来说，采用新方法要困难一些。

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The nation lacks a central population register or an identity-card system that would allow administrative data to be linked up.

该国缺乏一个中央人口统计处或一个身份认证系统来将管理数据统一起来。

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"Even if food is limiting the central population, " said Tinker, "it doesn't explain why there is not faster growth at the edges of the ranges."

Tinker说：“即使食物限制了其数量，这也不能解释在区域周边仍然没有数量上的快速增长。”

youdao

General McChrystal has said winning the population's trust is central to success in Afghanistan.

VOA: standard.2009.10.12

The English Civil War, the Thirty Years' War, in which in parts of central Europe a quarter of the population disappeared, were killed, murdered in ways that I will unfortunately show you in a while.

欧洲近四分之一人口,死于三十年战争和英国内战,稍后我会展示给你们看,我对此也很难过

耶鲁公开课 - 欧洲文明课程节选

New approaches are harder for countries that do not keep a central population register.

ECONOMIST: Censuses

We invest more in medical care but then there is less to invest in the social services that may be most central to the population's health.

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Latinos make up more than 60% of the population of South Central, the capital of black rap music, and more than 70% of the population of Watts, hotbed of black radicalism.

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