This is why the convex hull algorithm front of some preparation work!
这个正是凸包算法前面的一些准备工作！
The convex platform at the front edge of the base-plate not only enhances the strength of the base-plate, but avoids clamping stagnation in the process of feeding paper, which is reliable.
底板前缘的凸台既加强了底板的强度，且在送纸时不会产生卡滞现象，使用可靠。
The diaphragm is formed to make maximum a difference in air pressure of the front surface and the rear surface of the diaphragm, thereby forming any one of concave and convex shapes thereof.
隔膜形成为使得隔膜的前表面和后表面的气压差最大，这样，从而形成它的凹形形状和凸形形状中的任意一个。
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