渠床砂砾石料垫层  grit and gravel in the channel bed

砂砾石垫层  sand-gravel cushion

碎石(夹砂)垫层  gravel cushion

人工砂砂垫层  artificial aggregate cushion

垫层砂  bedding stone

垫层砂浆  bedding motar

含卵砾石砂层  sand layer with gravel

含卵石砂层  pebbly sand

泌尿系统结石砂石淋  urinary stones sandy uroliths

硼砂垫层  borax liner

砂垫层  sand blanket; sand cushion; sand mat; sand layer; sand bedding; cushion

砂垫层厚度  thickness of sand mat

砂垫层渗透性  permeability of sand cushion

叠层石层  stromatolite layer

碎石垫层  gravel mattress; hardcore bed; hardcore; crushed-stone cushion; crushed stone layer

碎石垫层料  cushion layer material; crushed stone cushion

2000#金刚石砂轮  diamond grinding wheel

9砂层组  the 9th sandbody group

阿尔伯达油砂层开采技术研究管理局  AOSTRA