Heavy rain can quickly wash away the rich top soil on flat, open land. 飄潑大雨能很快地沖走那裡的平坦開闊的表層土壤。
Topsoil from different soil types shall be stockpiled separately and replaced in the same areas from which they were taken. 不同類型的表層土壤應分開儲存，更換時也應置放於取土的同一區域。
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