英语翻译building up of dark value by means of thin parallel lines.Apply one layer of lines parallel to each other using an even more pressure all the way across.Go back over them when necessary to darken the tone.This is the most basic shading technique.It requires a steady hand practice.practice in the square on right.不要google 翻译我已查过

英语翻译
building up of dark value by means of thin parallel lines.Apply one layer of lines parallel to each other using an even more pressure all the way across.Go back over them when necessary to darken the tone.This is the most basic shading technique.It requires a steady hand practice.practice in the square on right.
不要google 翻译
我已查过