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。

youdao

A layer of special fabric covers the gravel.

一层专用的织物覆盖着砂砾。

youdao

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。

youdao

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。

youdao