clear area of screen

clear... ... clear area 清洁区,空白区 clear area of screen [化]筛的有效面,筛的净面 clear as a bell 很清楚,很健全,很正确 ...

... ) effective sieve area 有效筛选面积 ) clear area of screen 筛的有效面积，筛孔净面积 ) clear area of screen 筛的有效面 ...

... ) effective sieve area 有效筛选面积 ) clear area of screen 筛的有效面积，筛孔净面积 ) clear area of screen 筛的有效面 ...