“number of person-days”的概念、定义、翻译、参考文献-科学参考

单词	number of person-days
释义	number of person-days Encyclopedia 工学膳食调查释 number of person-days人日数包括总人日数和个人人日数，是指以被调查对象的一日三餐为标准折合的用餐天数，将每人每日的三餐定义为一个人日。
随便看	cosmic background radiation, CMBR cosmic brightness cosmic catastrophe cosmic censorship cosmic censorship conjecture cosmic censorship hypothesis cosmic chemistry cosmic cloud cosmic constant cosmic critical density cosmic dark ages cosmic deceleration cosmic density field cosmic density parameter cosmic diffuse infrared background cosmic distance cosmic distance ladder cosmic downsizing cosmic dust cosmic dust detection cosmic electrodynamics cosmic emission cosmic environment Cosmic Evolution Survey cosmic expansion

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。