“population pyramid”概念、定义、翻译-科学时代

单词	population pyramid
释义	社会学词汇手册 population pyramid 人口金字塔
随便看	loam moulding loam sand loam sand mould loam soil loamy loamy clay loamy fine sand loamy fine soil loamy sand loamy soil loamy texture loan loan loan loan loan loan loan loan loan loan loan loan loanable loanable fund

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。