你可能知道，地球围绕太阳的轨道形状不像一个完美的圆。
You are probably aware that the earth's orbit around the sun is not shaped like a perfect circle.
有一个故事说教皇波尼法爵八世曾向乔托索要创作样本，乔托只用了简单的一笔就画了个完美的圆，然后将圆送给他，这件事给教皇留下了深刻的印象。
One story about Giotto tells how he sent Pope Boniface VIII a perfect circle painted with a single brushstroke when asked for samples of his work. The Pope was apparently very impressed.
如果一个或多或少，有点圆的盘子能让我想到正圆，柏拉图认为， 我必须已经见过完美的圆本身了。
In order for a more or less round plate to remind me of roundness, Plato says, I have to have already met perfect roundness itself.
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