The sun is the most parallel light source because it is so far away.
太阳是最平行的光源，因为它离我们很远。
-- Conrad Hall 康拉德·霍尔
The sun is the most parallel light source because it is so far away.
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The sun is the most parallel light source because it is so far away.
太阳是最平行的光源，因为它离我们很远。
-- Conrad Hall 康拉德·霍尔
