“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	non-singular matrix nonsingular matrix nonsingular model nonsingular operator nonsingular perspectivity nonsingular point nonsingular projective transformation non singular quadratic form non-singular quadratic form nonsingular quadratic form non singular real algebraic variety non-singular real algebraic variety nonsingular real algebraic variety nonsingular solution nonsingular space nonsingular spacetime nonsingular stochastic process nonsingular surface nonsingular system non singular transformation non-singular transformation nonsingular transformation nonsingular value nonsingular variety nonsingular zero

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。