“生态灾荒”的概念、定义、翻译、参考文献-科学参考

单词	生态灾荒
释义	生态灾荒 Encyclopedia 农学〔生物入侵社会影响〕释 ecological famine生态灾荒由于人类或自然的因素导致生态系统平衡被打破所致的生态危害，并进而引发人类社会的动荡和不安。
随便看	nonnegative divisor nonnegative element nonnegative function nonnegative integer nonnegative integral kernel nonnegative manifold nonnegative matrix non-negative matrix factorization nonnegative measure nonnegative number nonnegative operator nonnegative orthant nonnegative partial sum nonnegative quadratic form nonnegative semi-definite matrix nonnegative solution nonnegative splitting nonnegativity nonnegativity condition nonnegativity requirement non nesting matching non-nesting matching nonnesting matching non nesting partition non-nesting partition

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