The pressure of population on available resources is the key to understanding history; consequently, any historical writing that takes no cognizance of demographic facts is intrinsically flawed.
人口对于可利用资源的压力是明了历史的关键，所以，任何的历史写作如果没有认识到人口统计学的事实都是本质错误的。
Cost of human resources can be measured by methods of historical cost, replacement cost, opportunity cost, and so on.
人力资源成本可通过历史成本法、重置成本法、机会成本法等计量方法进行计量。
Henan's resources of historical culture are characterized by long history, wide distribution, rich category, high grade, and so on.
河南的历史文化资源具有历史悠久、分布广泛、类型齐全、档次高、可观赏性强等特点。
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