Even though the bottom one takes up the least amount of space in this optical illusion, it is the flattest circle and therefore has the largest diameter.
尽管下面的圈看起来占的地方最小，但是它是最平坦的，也就是它的直径是最大的。
Even though the bottom one takes up the least amount of space in this optical illusion, it is the flattest circle and therefore has the largest diameter.
尽管下面的圈看起来占的地方最小，但是它是最平坦的，也就是它的直径是最大的。
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