清晨的阳光洒在大地上，万物复苏，生命重新焕发活力。我的老师美如妖
作者：终怡伟, 发布时间：2026-02-03 20:00:47
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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