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。
Create a rectangular path inside our path and select Subtract from option bar. Add two sharp points on each corner, after that delete all corners.
创建一个矩形的路径选择在我们的路径选择删减酒吧。加两个锋利的分，每一个角落，之后，删除所有的角落。
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