“left-behind elderly”的概念、定义、翻译、参考文献-科学参考

单词	left-behind elderly
释义	left-behind elderly Encyclopedia 法学老年社会问题释 left-behind elderly留守老人因子女离开而留在原家庭中的老年人。根据中国对人口迁移流动的定义，严格意义上的留守老人指因子女离开（跨越县级以上行政区）半年及以上而留守在家的老年人。
随便看	time variant data time-variant parameter time-varying channel time-varying control systems time-varying electromagnetic field time-varying formation control time-varying gravity field time-varying model time-varying nonlinear flight control time varying system time-varying system time-varying systems time voice announcement time-wages Time Warner time weighted average time weighted average (TWA) time zone time–space compression Timgad timing timing accuracy timing age timing analysis timing analyzer

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。