如果一个体积足够大的星体从一个距离很远的恒星前面经过，那么会产生透镜效果，使那个恒星的光线产生弯曲或变形，这样就能很清楚的看到这个星体。
If a large object passes in front of a more distant background star, it may act as a lens, bending and distorting the light of that star so that it may appear to brighten significantly.
这还是没有把大气层因素考虑进去的结果，而大气层造成的变形、光线折射以及减弱对比度等因素都会缩短能看清长城的最远距离。
This doesn't take into account atmospheric distortion, refraction through a window, or less than ideal contrast, all of which would lessen the real distance at which it could be discerned.
由于这种变形，进入眼睛的光线无法清楚地聚焦在视网膜上。
Because of the imperfection, light entering the eye is not clearly focused on the retina.
由于这种变形，进入眼睛的光线无法清楚地聚焦在视网膜上。
Because of the imperfection, light entering the eye is not clearly focused on the retina.
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