(印刷机).Then single letters could be __1____2__ to different parts of the press,depending on which words were__3__on a certain page.This was one of the most important __4__ in the history of printing.
__5__,most books had been created by copying out text by hand.The__6__of a single book would take many hours or even days.With the Gutenberg press,__7__ could be printed in several seconds,and many copies of books could be created in a few hours.
Gutenberg's printing press was not so much a(n)__8__,however,as an improvement of developing technologies.The Chinese were the first to use wooden blocks(木刻版)as the 8th century.Then great __9__was made around 1040.The movable type was invented by Bi Sheng in China.European __10__the printing methods centuries later.Another contribution to Gutenberg's system also came from the East,__11__.The Chinese invented paper using __12__materials,including old clothes.The kind of the inexpensive paper was introduced into Europe in 1000 or so.This kind of paper was __13__for the new European printing presses,__14__it took in the only ink required for the metal type.
Printing soon became an important __15__in a rapidly growing world.By 1500,nearly 35,000 books were in print worldwide.But the printing press did not __16__a lot for a long time.In the 19th century,however,iron __17__wood in the press' framework.And paper became__18__in continuous rolls rather than more expensive single pieces.Steam engines __19__the speed at which the press ran.In the late 1900s,the introduction of better presses greatly __20__the time it took to turn ideas into books.
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