low density layer 低密度层
In order to avoid the occurrence of dried soil layer, it is necessary to select the tree species with slow growth and low water consumption, and the afforesting density should be reduced.
为防止严重的土壤干层发生，选择生长较缓慢、消耗水分少的树种是必要的，并应减小造林树种植株密度。
The bi layer structural carbon cluster like microwave stealthy material coating was designed and prepared by making use of low density carbon cluster like material.
通过微波隐身材料结构设计，采用密度较小的碳团簇型原料，制备得到了具有良好吸波性能的双层结构碳团簇型微波隐身涂层材料。
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