回填砂
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unconventionamly thick backfilled sand 大厚度回填砂
sand backfilled 砂回填
sand backfilled base 回填砂
Sand DAMS, which are constructed out of concrete barriers 1-5m high and backfilled with sand, were voted as the best idea from five different proposals.
用混凝土护栏建造的1至5米高且用沙回填而成的砂坝从5个不同方案中脱颖而出，被选为最佳方案。
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