中文：

人口红利是指一个国家或地区在一定时期内，由于劳动年龄人口占比较高，总人口抚养比下降，从而形成劳动力资源相对丰富、人口负担相对较轻的局面。这种人口结构优势可以为经济发展带来诸多机遇和有利条件。

在人口红利时期，劳动力资源充足，劳动力成本相对较低，社会抚养负担较轻，这为经济发展提供了广阔的空间和巨大的潜力。特别是在工业化、城市化加速发展的阶段，人口红利可以为经济增长提供强有力的支撑。

然而，人口红利不是永远存在的，其可持续性受到多种因素的影响。例如，随着人口结构的变化，劳动年龄人口比例下降，总人口抚养比上升，这将对经济和社会发展带来新的挑战。此外，劳动力素质、产业结构、科技创新能力等因素也会影响人口红利的实现和持续时间。

因此，要充分利用人口红利促进经济发展，需要制定科学合理的人口政策和经济政策，提高劳动力素质和技能水平，推动产业升级和技术创新，以保持经济持续健康发展。

总的来说，人口红利是一个国家或地区在一定时期内具有的人口结构优势，可以为经济发展带来诸多机遇和有利条件。但要实现人口红利的可持续性，需要制定科学合理的人口政策和经济政策。

英文：

Demographic dividend refers to a situation in which a country or region has a relatively high proportion of working-age population and a relatively low total dependency ratio during a certain period of time. This demographic structure advantage can bring many opportunities and favorable conditions for economic development.

During the demographic dividend period, there is an abundance of labor resources, relatively low labor costs, and a light social care burden, providing enormous potential and broad space for economic development. Especially during the accelerated development of industrialization and urbanization, demographic dividends can strongly support economic growth.

However, demographic dividends are not always present and their sustainability is affected by various factors. For example, with changes in the demographic structure, the proportion of working-age population decreases and the total dependency ratio rises, which will pose new challenges to economic and social development. In addition, factors such as labor quality, industrial structure, and technological innovation ability will also affect the realization and duration of demographic dividends.

Therefore, to fully utilize demographic dividends to promote economic development, it is necessary to formulate scientific and reasonable population policies and economic policies, improve labor quality and skill levels, promote industrial upgrading and technological innovation, so as to maintain sustained and healthy economic development.

Overall, demographic dividend is the demographic structure advantage that a country or region has during a certain period of time, which can bring many opportunities and favorable conditions for economic development. But to achieve the sustainability of demographic dividends, it is necessary to formulate scientific and reasonable population policies and economic policies.