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在阳光明媚的日子里,孩子们在草地上欢快地奔跑嬉戏,笑声不断。yy11111光棍影阮手机版

更新时间:2025-11-29 21:19:22 | 人气:586496 | 作者:宣洁洁,田伟铂, |

  Human hearing is capable of detecting sound waves between 20 and 20.000 Hz. ... merely a small fraction of the frequency spectrum. Most sounds around us go unnoticed.


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