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3
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325
细舆媚砜
morning and dusk line
没事就做吃货
The Earth is round, I come back after rolling a circle around it.
零碎的回忆123
晨昏线与太阳光线垂直，平分赤道，二分日时晨昏线与经线重合，二至日时晨昏线与经线夹角最大。
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