不要用塑料布等不透水材料覆盖割草机。
Do not cover the mower with impermeable materials - such as plastic sheets.
根据已有透水材料的共同特点，以细砂密集堆积体为基质，环氧树脂为胶结料，制备出一种微孔透水性材料。
A kind of micro-porous permeable material is prepared based on common features of existing permeable materials and taking dense accumulation of fine sand as the matrix and epoxy resin as binder.
透水混凝土是一种新型的建筑材料，国内对它的研究还不成熟。
Porous concrete is a kind of new building material, and the domestic researching was not mature.
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