“雪岭云杉”的概念、定义、翻译、参考文献-科学参考

单词	雪岭云杉
释义	雪岭云杉 Encyclopedia 农学〔用材树种〕释 schrenk spruce雪岭云杉松科云杉属一种乔木。是新疆天山地区的主要森林及用材树种。
随便看	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 positive semi-definite Hermitian matrix positive semi-definite kernel positive semi definite matrix positive semi-definite matrix positive semi-definite operator positive semi definite quadratic form positive semi-definite quadratic form

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。