gravel [ˈgrævl]

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n.砂跞；砂砾层；结石

small rounded stones , often mixed with sand

We bought six bags of gravel for the garden path. 我们购买了六袋碎石用来铺花园的小路。
More gravel is needed to fill the hollow in the drive. 需要更多的砾石来填平车道上的坑洼。