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人们在日常生活中,通过预设在窗帘上方的滑轨,利用窗帘拉绳开启窗帘。但常常出现不知道该拉动哪一根拉绳,才能达到所需要的开或关窗帘的目
People in their daily lives, through the curtains in the curtain above the preset, the use of curtains to open curtains draperies. But often do not know which pull the rope, in order to achieve the required opening or closing of the curtain