graveln.碎石v.铺碎石;使困惑
gravel pack砾石过滤层
gravel fill砂砾淤积
gravel flow砾石流
Gravel rock砾岩
gravel size砾石尺寸
gravel stop挡石片
gravel bank砾石崖
gravel walkn.砂砾路
gravel soil砂砾土
gravel clay砾质黏土