graveln.碎石v.铺碎石;使困惑
gravel-piles辟石桩
gravel deposit冲积矿床,砾石沉积物
gravel ballast砾石道碴
gravel surface砾石道面
gravel sediment卵砾石
gravel porosity石子空隙率
gravel counting砾石统计
gravel movement砾石移动
Gravel and soil碎石土
gravel sidewalk砾石人行道