题目：Which of the following is NOT included among the contribution of terraces?
They scientifically minimize the soil erosion.
They reduce soil surface runoff.
They improve the soil fertility.
They decrease water conservation.
题目：Which of the following is NOT included among the contribution of terraces?
They scientifically minimize the soil erosion.
They reduce soil surface runoff.
They improve the soil fertility.
They decrease water conservation.
