gravels

• Gravelly - sand over an iron - pan and gravel layer
  沙砾覆于铁质土层与砂砾层之上。
• Research on foamed mac - asphalt gravel mixture
  泡沫沥青稳定碎石混合料的研究开发
• As it moves , a glacier picks up rock and gravel
  当冰河移动时，会带走岩石和碎石。
• Smoothness control of cement stabilized gravel stratum
  水泥稳定粒料基层平整度控制
• The stability analysis on sandy gravel as road base
  砂砾石作为道路基层的稳定性分析
• Gravel paching method for sand control in cased hole
  油井套管内砾石充填防砂工艺方法
• Layered gravel and charcoal to make a filter
  将砂砾和木炭分层以做成过滤器
• Construction supervision of cement stabilized gravel
  水泥稳定碎石施工监理
• They went out for a walk on the gravelled path
  他们在碎石小径上散步。
• Construction quality control of cement stabilized gravel
  浅谈水泥稳定碎石基层施工质量控制