“留守老人”的概念、定义、翻译、参考文献-科学参考

单词	留守老人
释义	留守老人 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	center-of-mass energy center of masses center of mass frame center-of-mass frame center of moment center-of-momentum frame center of momentum system Center of National Railway Intelligent Transportation System Engineering and Technology center of oscillation center of percussion center of perspectivity center of polarity center of principal curvature center of projection center of purity center of range center of reduction center of reflection center of rotation center of similarity center of similitude center of subsidence center of symmetry Center of the World center of volume

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。