在清晨的阳光下,花儿悄然绽放,鸟儿欢快歌唱。张杰快乐大本营
作者:朱家鳞, 发布时间:2025-10-18 01:53:22
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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