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[請問] 兩人搬運物品上下樓梯
Jul 2nd 2014, 16:45, by eventyr 

兩個人如果是一前一後搬物品上下樓梯

在樓梯處高位置的人 幾乎是彎著腰 很難搬又很難走

在樓梯處低位置的人則是物品的重量大部份壓向他
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