v engrave by means of dots and flicks
v make by small short touches that together produce an even or softly graded shadow, as in paint or ink
v apply (paint) in small dots or strokes
v produce a mottled effect
s having a pattern of dots
v. 加点、绘斑, 加粒( stipple的过去式和过去分词 ); （把油漆、水泥等的表面）弄粗糙