“population aging level”的概念、定义、翻译、参考文献-科学参考

单词	population aging level
释义	population aging level Encyclopedia 工学公共服务设施规划释 population aging level老龄化水平即人口老龄化水平，用来衡量社会人口结构的重要参数。用地区老年人口数与总人口数之比值来表示。
随便看	combination of medicine and education Combination of medicine and nursing combination of points of namesake channels，combination of points of namesake meridians combination of political and economic systems combination of prisms combination of sentences combination of several tunes combination of signs combination of source rock,reservoir and cap rock combination of sports and education combination of structure action combination of the nature and flavour combination of use and nourishment combination of vehicles Combination Principle combination principle combination printing combination printing machine combination reaction combination resonance combination resonator combination resonator, complex resonator combinations combination scattering combination set

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。