砂回填
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sand backfilled base 回填砂
backfilled sand 回填砂
unconventionamly thick backfilled sand 大厚度回填砂
sand backfilled
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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