117Please respect copyright.ＰＥＮＡＮＡoO0A3CScXK
有回音，只是極小聲，正常人耳無法聽見，用機器檢測即可從分貝圖表發現回音。
ns 172.69.58.240da2
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十萬個為什麼&奇聞異事
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