gravel
砂金矿
gravel mine【矿】;placer mine【矿】;
暂无补充释义。
相关词条
gravel filter layer
gravel-voiced
gravel bed (gravel base course), crushed-stone bed (crushed-rock bed)
gravel
gravel
gravel
gravel
gravel mine【矿】;placer mine【矿】;
暂无补充释义。
gravel
gravel filter layer
gravel-voiced
gravel bed (gravel base course), crushed-stone bed (crushed-rock bed)
gravel
gravel
gravel
gravel