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 convexshapes 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。
2
It may be flat, concave, and convex or any one of a great variety of shapes to promote turbulence or help control combustion.
活塞顶部可以做成平的、凹的、凸的或是能够促进涡流帮助燃烧的任何形状。
3
Various lines and shapes show planes of light reflections to the viewer. Convex and concave areas make for exciting shapes. Realistic design should look like a natural object.