“grassland degradation in China”的概念、定义、翻译、参考文献-科学参考

单词	grassland degradation in China
释义	grassland degradation in China Encyclopedia 理学中国草地退化释 grassland degradation in China中国草地退化中国天然草地在干旱、侵蚀、盐碱、虫鼠害等不利自然因素和过度放牧等不合理利用影响下，草地生物生产力减少、质量下降、草地利用率降低，甚至失去利用价值的过程。
随便看	positive definite bi-linear form positive definite closed form positive definite form positive definite function positive definite functional positive definite Hermitian matrix positive definite inner product axiom positive definite kernel positive definite matrix positive definiteness positive definite operator positive definite potential positive definite product positive definite quadratic form positive definite scalar product positive definite sequence positive definite solution positive definite space positive definite tensor positive definte rational fanction positive deviation positive diffeomorphism positive diffeomorphisms positive differential positive direction

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