The upper horizontal part of a step in a staircase.
楼梯或台阶水平部分。
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。
And this part is a parabola and this parabola here is horizontal.
这部分是条抛物线，抛物线这边是水平的。
And this part is a parabola and this parabola here is horizontal.
这部分是条抛物线，抛物线这边是水平的。
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