“child aged ratio”的概念、定义、翻译、参考文献-科学参考

单词	child aged ratio
释义	child aged ratio Encyclopedia 法学年龄释 child aged ratio老少比总人口中老年人口数与少儿人口数之比。一般以百分数表示。
随便看	spherical curvature spherical curve spherical cyclic curve spherical defect spherical deflection analyzer spherical deformation tensor spherical degree spherical density spherical derivative spherical design spherical digon spherical distance spherical distribution spherical domain spherical earth theory spherical element spherical equilateral triangle spherical excess spherical excess formula spherical fiber spherical field spherical form spherical Fourier transformation spherical free particle wave function spherical frustum

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。