“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	safety pedagogy safety performance safety performance evaluation safety period of fertility alteration safety pharmacology safety physiology safety pillar safety pre-evaluation safety production cost safety production incentive mechanism safety production index safety production insurance safety production liability insurance safety production license system safety production of hydropower station safety production qualification certification training safety production responsibility system safety production rules and regulations safety production strategy safety product validation safety profit safety protection safety protection and guarantee on navigable waters safety protection device safety protection for beryllium poisoning

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。