具有共轭点的类光测地线的固有加速度趋于无穷大。
It is shown that the proper acceleration of null geodesic with conjugate points approaches infinity.
动物主要借助网膜中的两类光感细胞获得视觉：视杆细胞帮助感知亮度，而种类众多的视锥细胞则帮助辨别颜色。
Retinas use two main types of light-sensitive cells to allow animals to see: Rod cells help measure brightness, while various types of cone cells help distinguish colors.
波导类光开关以其高速的特性将在全光交换系统中得到广泛应用，因此研制高性能的波导型光开关单元有其重要性和迫切性。
Due to high switching speed, waveguide optical switch will be applied widely to optical switching systems. It is urgent and important to develop waveguide optical switch with high performance.
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