请输入您要查询的字词:
单词
babybust
释义
babybust
Encyclopedia
理学
人口统计学
释
babybust
少子化
一个社会中随着人口总和生育率下降,少年儿童(0-14岁)占总人口比重降低的现象。一般将一个国家的总和生育率长时间低于维持人口长期稳定发展的更替水平(2.1),界定为少子化。
随便看
Travel Fu
travel guidance
Travel Heart
travel information service
travel information system
traveling beam tube
Traveling Cross the Creek and Mountain by Fan Kuan
Traveling Film Projection Team of China Film Studio
traveling fixture
Traveling Heroes of Justice
Traveling in Mountains
Traveling in West Mountain by Shen Zhou
traveling microscope
traveling on the river in snow
traveling salesman problem
traveling salesman problem (TSP)
traveling ship loader
traveling wave
traveling-wave antenna
traveling-wave electric curtain
traveling-wave gating-framing camera
traveling wave laser
traveling-wave laser
traveling-wave linear accelerator
traveling-wave maser
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。
Copyright © 2000-2023 Sciref.net All Rights Reserved
京ICP备2021023879号
更新时间:2025/11/30 12:34:35