“针鼹”的概念、定义、翻译、参考文献-科学参考

单词	针鼹
释义	针鼹 Encyclopedia 理学针鼹科释 echidna针鼹单孔目针鼹科物种的统称。
随便看	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 positive semi-definite rational function positive semigroup positive semiorbit positive semi-trough positive sense positive sense single-stranded RNA virus positive sequence

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。