由于人类在通信环境经历了从较早的转变,是由活字印刷的发明带来的。
Because mankind has lived through an earlier transformation in its communications environment, brought about by the invention of printing by movable type.
活字印刷术是什么时候发明的?
宋朝的毕昇发明了活字印刷术。
Bi Sheng invented the movable type printing in Song Dynasty.
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