清末民初虽然时间跨度不到2 0年，但却是一个社会经济变迁较大时代。
The late Qing and early Republican period spanned for less than 20 years, but it was a period marked by drastic socioeconomic changes.
各个时期的国家制度与政策对此发挥了关键作用，显示出人类社会经济行为对于环境变迁的影响。
The factors in system and policy played the key part in this course, which influenced the degree of environmental changes by human action for society or economy.
企业正在面临一个日益复杂多变的竞争环境，其所面临的市场由于人口和社会经济的大幅度的变迁而发生急速变化。
All companies now are facing a complicated and changeable competition environment, in which markets choppy changes are taking place as a result of demographic and social economic transitions.
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