Earth's orbit around the sun and tilt on its axis combine to carry us in this hemisphere further away from receiving the sun's rays most directly.
随着地球围绕太阳的轨道和轴的倾斜将我们带到这个半球，我们更远离直接接收太阳光线的地方。
The light is dying, for one thing, as Earth’s orbit around the sun and tilt on its axis combine to carry us in this hemisphere further away from receiving the sun’s rays most directly.
光线也在是失去活力，首先，由于地球绕着太阳的轨道，由于地球倾斜的轴线与我们所处的北半球相结合，最直接从太阳所接收到的光线，就愈为遥远。
Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.
球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
摘要分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象—笛卡尔线现象。
Spherical Aberration -- causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.
球差-使以不同孔径角穿过透镜（或从镜面上发射）的光线不能聚焦在轴上的同一点。
The parallel light rays of the prnicipal axis that approach a convex lens can converge to the focal point.
只有在近轴光线条件下，平行光通过凸透镜才可近似聚焦于一点。
The optical path difference of two rays in the condition of near axis is discussed in the single spherical surface refraction.
本文讨论了单球形折射面在傍轴条件下二相邻光束的光程差问题。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象？笛卡尔线现象。
An analysis is made about Descartes rays of transparent round-section fibers-a special internal surface reflection rays of the fiber when parallel rays strike the fibers perpendicularly to fiber axis.
分析了透明圆形截面纤维在垂直纤维轴光线照射时纱维内表面反射光的一种特殊现象？笛卡尔线现象。
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