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。
2
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。
3
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.