农场主大熊叔叔请来两位设计师为开心农场设计篱笆。两位设计师的设计方案如下:方案一:方案二:我觉得第一个设计方案的篱笆围得好看。我认为大熊叔叔会选择第一个方案。我可不这么认为。大熊叔叔应该会选择第二个设计方案。你还记得我们学过的三角形和四边形的性质吗?四边形具有不稳定性形具有不稳定性,第一个方案把篱笆围成四边形,风一吹篱 Uncle Bear, a farmer invited two designers to design the fence for a happy farm. The design of the two designers are as follows: Option One: Option Two: I think the first design of the fence around looks good. I think Uncle Big Bear will choose the first option. I do not think so. Big bear should choose the second design. Do you remember the nature of the triangles and quadrangles that we have learned? Quadrilateral instability is instability. The first is to enclose the fence in a quadrangular, wind-blown