The first segment and the fourth segment are generally lapped in a vertical projection direction, and the second segment and the third segment are generally lapped in a vertical projection direction.
该第一线段与该第四线段在一垂直投影方向大体上为迭合，且该第二线段与该第三线段在该垂直投影方向大体上为迭合。
The first segment and the fourth segment are generally lapped in a vertical projection direction, and the second segment and the third segment are generally lapped in a vertical projection direction.
该第一线段与该第四线段在一垂直投影方向大体上为迭合，且该第二线段与该第三线段在该垂直投影方向大体上为迭合。
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