“plastic mulch film”的概念、定义、翻译、参考文献-科学参考

单词	plastic mulch film
释义	plastic mulch film Encyclopedia 理学塑料地膜释 plastic mulch film塑料地膜覆盖在种植庄稼与蔬菜等植物的土地表面上的塑料薄膜。可以提高土壤温度，保持土壤湿度，改善土壤理化状况，防止病虫害，促进植物生长，特别对植物幼苗，具有护根、促生长的作用。
随便看	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 positive side positive sidelight positive sign positive skewness positive solution positive species interaction positive spinor positive staining positive strain energy positive strand positive subspace positive supportive reaction positive (symmetric) operator positive symmetric operator positive system of roots

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