And changes in consumer demand and the number of structures affected by many factors such as population, economic, social, cultural, psychological, and purchasing behavior of purchase.

而消费者的需求数量和结构的变化受到多方面因素如人口、经济、社会文化、购买心理和购买行为等的影响。

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As a weak group, the old age group is the special part of social population structures, and need to be protected particularly.

老年群体是社会人口结构中的特殊部分，处于弱势地位，需要给予特殊保护。

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However, some adjustments must be made in Medicare as changes happening in the structures of population and demands foe care.

人口结构和需求结构的变化需要医疗照顾制度作相应的调整。

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But the tragedy in Shanghai has prompted public warnings about the need for fire prevention, as Chinese cities continue to build high-rise structures to accommodate the burgeoning city population.

CNN: Deadly fire highlights China's growth problem