The lines or other marks used to fill in outlines of a sketch, an engraving, or a painting to represent gradations of color or darkness.是什么意思_The lines or other marks used to fill in outlines of a sketch, an engraving, or a painting to represent gradations of color or darkness.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句