“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	risk premium risk premium risk premium risk premium risk profile risk propensity risk register risk retention risk-return analysis risk set risk sharing risk shift risk-shift effect risk society risk society risk spreading risk-spreading risk taking risk threshold risk transfer risk transfer risk underwritten risk-utility test risk warning risk weight

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。