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The upper horizontal part of a step in a staircase.
楼梯或台阶水平部分。
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A horizontal guide frame is secured to the horizontal part of the stay rod.
水平导轨框架固定于所述撑杆的水平部。
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A horizontal guide frame is secured to the horizontal part of the stay rod.
水平导轨框架固定于所述撑杆的水平部。
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