“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	regular octahedron group regular one parameter subgroup regular one-parameter subgroup regular open set regular operation regular operator regular orbit regular ordinal regular ordinal number regular outer measure regular packing regular pair regular parameterized surface regular parametric representation regular parametrization regular parametrized curve regular part regular partial differential equation regular patch regular path expression regular pencil of matrices regular pentagon regular permutation regular permutation group regular perturbation

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。