The construction of elite building stopped after 800, and a gradual population decline ensued.

精华建筑的构建在公元800年后就停止了，随后人口也慢慢消减。

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Haiti is a poor country with lax building standards and high population density, which makes buildings more likely to crumble, according to Blakeman.

据布莱克曼说，海地是个贫穷的国家，建筑标准松散，人口高度密集，其建筑更有可能倒塌。

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The reason is that after a favored version of a gene has swept through the population, mutations start building up in its DNA, eroding the uniformity that is evidence of a sweep.

原因在于，当一个理想版本基因“扫描”一个人群，变异便开始在DNA中逐渐累积，这会将基因的统一性——基因扫描的证据——加以破坏。

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Clearly, the success of Detroit Future City depends on building population density around certain neighborhoods that are already in decent shape and stabilizing home values there.

FORBES: Detroit's Innovative Survival Plan Is A Model For The World - But Will It Work?

Baby boomers born in the 1940s to mid 60s bought their first home when prices were low and watched property prices shoot up as house-building slowed while the population rose.

BBC: Have young people never had it so bad?

It is hoped that building more compactly will increase population densities in cities that have been losing people.

ECONOMIST: The pre-budget report