To avoid forming layer defect, rising pouring temperature are using improved coating and selecting lowdensity styrofoam pattern are a great help.
提高金属液浇注温度及改良涂料，选用低密度泡沫塑料作模样材料对避免产生分层缺陷有帮助。
2
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。
3
The bi layer structural carbon cluster like microwave stealthy material coating was designed and prepared by making use of lowdensity carbon cluster like material.