“Population pyramid”的概念、定义、翻译、参考文献-科学参考

单词	Population pyramid
释义	Population pyramid Encyclopedia 医学健康统计释 Population pyramid人口金字塔按性别和年龄表示人口分布的一种塔状条形图。
随便看	quarter wave plate quarter-wave plate quartet quartic quartic curve quartic equation quartic equation with one unknown quartic extension quartic graph quartic manifold quartic parabola quartic polynomial quartic reciprocity theorem quartic residue quartics quartic surface quartic symmetric graph quartic symmetry quartic vertex-transitive graph Quartier Latin quartile quartile coefficient quartile deviation quartile range quartile skewness

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。