... concrete covering-layer 混凝土覆盖层 double-covering-layer 双覆层 covering soil layer inside levee 堤内压盖 ...
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The best is double plastic membrane cover, although more expensive than plastic covering layer higher, but the heat preservation effect is good.
最好是覆盖双层塑膜，虽然成本比单层塑膜覆盖高些，但保温效果较好。
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