rappel, upside down. 垂降, 倒掛

Palestinian members of al-Qassam Brigades, the armed wing of the Hamas movement, rappel from a building upside down during a military parade marking the 27th anniversary of Hamas' founding, in Gaza City on December 14, 2014. (Reuters/Suhaib Salem) #
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Photos of the Week: 12/13-12/19 - In Focus - The Atlantic
http://www.theatlantic.com/infocus/2014/12/photos-of-the-week-12-13-12-19/100876/
rappel是什么意思_rappel的翻译_音标_读音_用法_例句_爱词霸在线词典
n.绕绳下降；坐式下降法
v.用绳索下降
http://www.iciba.com/Rappel
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