n.铺砾石
My father scratched gravel for Shanghai last night. 我父亲昨晚匆匆忙忙去了上海。
The road is covered with gravel. 这路用砾石铺成。
We bumped up and down along the gravel path. 我们沿砾石小路颠簸而行。
The gravel ingredient of concrete. 石碴组成混凝土的砂料
Layered gravel and charcoal to make a filter. 将砂砾和木炭分层以做成过滤器
The workers mixed the asphalt with sand and gravel together. 工人们把沥青和沙子、石块混合在一起。
