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Перевод: subbase

нижняя часть цоколя

Тезаурус:

1. To lay a path or drive simply excavate the area to a depth of about 6in (150mm), or 8in (200mm) on soft clay soils, and ram in a 6in thick layer of hardcore or hoggin, covered with a thin layer of sand to prevent the gravel from sinking into the subbase.