“成都平原史前城址”的概念、定义、翻译、参考文献-科学参考

单词	成都平原史前城址
释义	成都平原史前城址 Encyclopedia 工学〔早期聚落〕释 prehistoric cities in the Chengdu Plain成都平原史前城址中国新石器时代末期或铜石并用时代（公元前2500～前1600）分布于四川盆地川西平原地区的宝墩村文化城邑遗址的群落。位于四川省成都平原的岷江冲积扇上。
随便看	positive quadratic differential positive quadratic form positive quantity positive ray function positive real axis positive real control positive real function positive real number positive real part positive real system positive recurrent point positive recurrent state positive reinforcement positive relation positive result positive root positive root system positive rotation positive school of criminology positive selection positive self-adjoint operator positive self-regard positive semi-definite positive semi-definite form positive semi definite Hermitian matrix

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。