三是历史依赖型，主要以原有专业为基础。
Three is a history dependence type, main with original profession for foundation.
和其他专业培训一样，我们以之前的知识为基础。
Like any other professional training we build on pervious knowledge.
其中许多都是非常专业的，但造纸的优势是用软木材和棉花或破布，大部分是以木材为基础。
Many of these are very specialized, but the preponderance of paper making has been from soft wood and cotton or rags, with the bulk being wood-based.
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