Substitution is a universal phenomenon in social and economic activities.

替代是普遍存在的、不可避免的经济社会现象。

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Risk, following the society wealth' s steps, is born within the social and economic activities.

风险内生于人们的社会、经济活动，人们的风险偏好随财富同方向变化。

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Urban public facilities which serve as the basis for urban social and economic activities are critical to urban life.

城市公共基础设施是城市生活的命脉，是整个城市社会经济活动的基础。

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Large-scale land concessions often generate a planning blight effect, which here refers to the uncertainty and deleterious effects on the social fabric and economic activities in targeted areas once a land allocation decision is made, or once negotiations between government and prospective investors have begun.

UNESCO: Madiodio Niasse on the risks associated with large-scale foreign land aquisitions | United Nations Educational, Scientific and Cultural Organization

In reality, water cuts across all social, economic and environmental activities.

UNESCO: World Water Assessment Programme (WWAP)

"There's a huge tension between the importance of the Internet for 'benign' activities like economic and social uses and its more controversial political activities, " he says.

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