As you can see, only half of the rail is swept, because the sweep starts from middle, where the profile curve is positioned. Select the surface and mirror it in the Top viewport as shown below.
就像你看到的，只有一半轨迹被扫描，因为是从轮廓曲线中点的位置开始的，选择面，然后在俯视图中进行镜像，如下图。
The factors affecting the water-surface profile and channel storage curve may be summarized as the physical geographical condition and the flow regime of the river reach.
影响水面线及槽蓄曲线的因素可概括为河段自然地理状况及水流情势。
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