If you select two points on closed surface (a cylinder for example), the result may be unstable.
如果你选的两点在一个封闭的面上(例如圆柱)，那结果是不稳定的。
What he got was two consultants who spent hours brainstorming ideas and helping him select the five or six points he highlighted in his essays.
他得到的服务包括两个顾问花费数个小时和他进行头脑风暴，帮他选择五到六个论文中强调的要点。
That directly implies that if we were to select either one of the two measurement points shown as a reference point then clearly we would not see all the modes of the structure.
这直截了当地表明了如果我们选定所示的这两个测点中的任何一个作为参考点，那么很显然我们将观察不到结构的所有阶模态。
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