首先要挖掘及处置土方，其后是平整场地，原先的坡度必须减缓至新的仰角。
Excavation follows preparation of the site, and is performed when the existing grade must be brought down to a new elevation.
首先要挖掘及处置土方，其后是平整场地，原先的坡度必须减缓至新的仰角。
Excavation follows preparation of the site, and is performed when the existing grade must be brought down to a new elevation.
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