Murphy :: 回音壁
皇穹宇外的圓形圍牆是有名的回音壁,由於聲波的折射,從牆的這邊說話,另一邊可以聽得非常清楚。更妙的是,即使在攝氏38度仲夏走在圓形圍牆外,你依然感覺清涼如水
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Last changed: May 09, 2005
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