“sandy desertification in China”的概念、定义、翻译、参考文献-科学参考

单词	sandy desertification in China
释义	sandy desertification in China Encyclopedia 理学中国沙漠化释 sandy desertification in China中国沙漠化中国干旱、半干旱地区和部分半湿润地区在干旱多风和疏松沙质地表条件下，由于人为过度利用土地等因素破坏了脆弱的生态平衡，使原非沙漠地区出现了以风沙活动（风蚀、粗化、沙丘形成与发育等）为主要标志的土地退化过程。
随便看	quadratic estimator quadratic expression quadratic extension quadratic extension field quadratic factoring method quadratic field quadratic field extension quadratic form quadratic form of a knot quadratic form of a link quadratic form of a quiver quadratic form over a vector space quadratic form rank quadratic form signature quadratic forms of same type quadratic formula quadratic function quadratic functional quadratic group quadratic hypersurface quadratic ideal quadratic inequality quadratic inequality constrained least squares problem quadratic inequality constrained least-squares problem quadratic integrability

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