燕子展示驚人飛行特技輕鬆穿過5厘米門縫
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據英國媒體7月29日報導，攝影師在英國拍下了一隻燕子以35英里/小時的速度穿越2英寸（約5.08厘米）門縫的畫面，燕子熟練巧妙的調整它14英寸（約35.56厘米）翼展，展現了令人驚訝的特技飛行。<br>
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