“population composition by age”概念、定义、翻译-科学时代

单词	population composition by age
释义	人口学词汇手册 population composition by age 人口年龄构成
随便看	liquid oxygen tank liquid paraffin liquid paraffin liquid paraffin liquid paraffin preservation liquid penetrant inspection liquid permeation liquid petrolatum liquid phase liquid phase liquid phase epitaxial method liquid phase epitaxy liquid phase epitaxy--liquid phase epitaxy (LPE) liquid phase epitaxy (LPE) liquid phase epitaxy (LPE) liquid phase method liquid phase sintering liquid phase sintering liquid phase sintering liquid phase sputtering liquid polymer liquid power liquid pressure water-level control valve liquid propellant liquid propellant rocket engine

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。