40 % of the entire dam area is the present river itself and the flooded areas are stiff slopes along the river bank .
Of the total dam area , 40 % is the present river itself and the inundated areas are stiff slopes along the river bank .
Of the total dam area , 40 % is the present river itself and the inundated areas are stiff slopes along the river bank .
为这句话写一个解释: 40 % of the entire dam area is the present river itself and the flooded areas are stiff slopes along the river bank . 输出: