Both the ray path formula and the inversion formula are very simple.
射线路径公式和反演公式都很简单。
That little joke or note, or just a simple "hi", Could be like a ray of sunshine from the sky!
尽管玩笑或祝愿有时仅仅只是一声“你好”——那样简单，它却象一束来自天际的暖阳！
That little joke or note, or just a simple "hi", Could be like a ray of sunshine from the sky!
尽管玩笑或祝愿有时仅仅只是一声“你好”——那样简单，它却象一束来自天际的暖阳！
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