“防护林”的概念、定义、翻译、参考文献-科学参考

单词	防护林
释义	防护林 Encyclopedia 工学〔树木造景〕释 protective forest防护林可以保持水土、防风固沙、涵养水源、调节气候、减少污染，起到改善生态环境和人类生产、生活条件作用的有林地、疏林地和灌木林地。农学防护林释 protection forest防护林以改善生态环境为主要目的营造的森林。是中国林种分类中的主要林种之一。
随便看	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 positive series

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。