Learners, therefore, must have books, and the right type of book, for the satisfaction of their need.
因此,为了满足他们的需要,学习者必须有书,而且是适合自己的书。
Printing with moveable type on paper dramatically reduced the cost of producing a book compared with the old-fashioned ones handwritten on vellum, which comes from sheepskin.
羊皮纸是用羊皮制作的,与在羊皮纸上手写的老式方法相比,在纸上进行活字印刷大大降低了生产书籍的成本。
Printing with a moveable type on paper dramatically reduced the cost of producing a book compared with the old-fashioned ones handwritten on vellum, which comes from sheepskin.
羊皮纸是用羊皮制作的,与在羊皮纸上手写的传统方法相比,在纸上进行活字印刷大大降低了生产书籍的成本。
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