It is wise to start infilling with a layer of gravel for drainage.
先铺上一层利于排水的砾石是个明智的做法。
A layer of special fabric covers the gravel.
一层专用的织物覆盖着砂砾。
Then a layer of gravel and a little water was applied and trampled solid.
然后铺一层砾石并洒上少许水用来踩实。
Then a layer of gravel and a little water was applied and trampled solid.
然后铺一层砾石并洒上少许水用来踩实。
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