Small Density too big when, not only indoor carbon dioxide and hydrogen sulphide ammonia, the harmful gas such as increased, the temperature increases, the air cushion wet grass.
密度过大时，不仅室内二氧化碳及氨气、硫化氢等有害气体增加，空气温度增高，垫草潮湿。
Up near the ridge I stop at a circle where the deer have matted the soft grass into a cushion.
爬到山脊不远处，我在野鹿卧在软草上压成的一个圆圆的草垫前停下。
Therefore, the study design does not rely on a kind of cushion, can be embedded with the upper part of grass-roots associated with a new concrete waterproofing material, is the best choice.
故此，研究并设计一种不依赖于垫层，能够与上部基层混凝土相嵌联的新型防水材料，就成为最佳选择。
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