To speed up the hardening process, artificial aging is employed.

加快硬化过程中，人工时效是就业。

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And with the process of population aging was speed up in rural area. The fluctuating of mortality was influenced by demographic and non-demographic factors in common.

农村地区人口老化程度加快，人口因素与非人口因素共同影响死亡率的变化。

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And with the process of population aging was speed up in rural area. The fluctuating of mortality was influenced by demographic and non-demographic factors in common.

农村地区人口老化程度加快，人口因素与非人口因素共同影响死亡率的变化。

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