“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	Pontryagin characteristic class Pontryagin characteristic number Pontryagin class Pontryagin duality Pontryagin duality theorem Pontryagin duality theory Pontryagin invariant Pontryagin-Kuratowski theorem Pontryagin maximum principle Pontryagin multiplication Pontryagin number Pontryagin operation Pontryagin product Pontryagin space Pontryagin square Pontryagin surface Pontryagin theorem Pontryagin van Kampen duality theorem Pontryagin-van Kampen duality theorem Pontypool japanned wares Pontécoulant crater Pood pool boiling pooled pooled error

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