《荀子·劝学篇》中有这样一句话:“青,取之于蓝而青于蓝。”成语“青出于蓝”就源自荀子的这句话。这里的“蓝”指的不是颜色,而是一种染青植物。意思是说,青色的染料是从蓝这种植物中提取的,但是颜色比蓝这种原料的色泽更鲜艳夺目。荀子说的这句话是把“提取过程”比喻为“学习过程”,强调只有经过学习才能 “Xunzi Encouragement” has such a sentence: “Qing, take blue and blue in blue.” The idiom “blue out of blue” is derived from the words of the nephew. The “blue” here refers not to color but to a dyed green plant. This means that the blue dye is extracted from the blue plant, but the color is more vibrant than the blue. The sentence that Xun Zi said is a comparison of the “extraction process” to a “learning process,” emphasizing that only after learning can