From the sound of nature's natural sounds to the various sounds made in social life, human beings cannot leave the sound. But in a long historical period, there is a lack of technical means to effectively save sound. In the world between the flute player and the record In the past millennium, although the sound was constantly carried and passed on to civilization and life, its original content could not be preserved, and many of the sounds recorded in historical documents became extinct. This was a great regret for civilization. Until 19 At the end of the century, as the tide of the industrial revolution swept Europe and the United States, human beings made breakthroughs in the field of recording and copying sounds, and parlours and records came out one after another. What does this text mean? ['Humans have made long-term efforts to effectively preserve the initial content of sound.', 'Sound preservation technology is one of the major achievements of the Industrial Revolution.', 'c. Breakthroughs in recording technology make human civilization more complete.', 'The lack of sound data is one of the regrets in the process of human civilization.']