“old dependency ratio”的概念、定义、翻译、参考文献-科学参考

单词	old dependency ratio
释义	old dependency ratio Encyclopedia 法学年龄释 old dependency ratio老年抚养比人口中老年人数与劳动年龄人数之比，以百分数表示。又称老年抚养系数。
随便看	pre-stellar evolution pre-stellar matter pre-stellar object Prestes Column Preston prestore prestrain prestratification prestratified prestress pre-stress cementing prestressed prestressed anchor prestressed anchorage prestressed concrete prestressed concrete bridge prestressed concrete cylinder pipe prestressed concrete structure prestressed jack prestressed steel bar binding machine prestressedsteel heading prestressed steel tensioning machine prestressed strand prestressed structure prestressed tendons with anchors

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。