The age of a tree is told by the number of the rings in the wood. 树的年龄是从木头上圆环状条纹的圈数而得知的。
The number and widths of the ring-type electrodes are further optimized to reach certain required levels of PSF and MTF for the LC lens. 藉此成像品质评估方法对具多圈电极之液晶变焦透镜的电极宽度与圈数做最佳化设计，以达成所需之成像品质的要求。
