短語(yǔ)詞組短語(yǔ)sand soil layer 砂土層blowing sand boundary layer 風(fēng)沙邊界層sand -layer liquefaction 砂土液化compound sand cushion layer 複郃砂墊層sand mat layer 砂墊層sand filter layer 砂濾層sand cushion layer 砂墊層thin sand powder layer 粉細(xì)砂地層 返回 sand layer