Imagine a burning candle, and imagine moving a sheet of heavy paper slowly over the flame of the candle, you're gonna get a series of burned spots in the paper.
想象一下一根燃烧着的蜡烛，再想象一下慢慢把一张很厚的纸移到蜡烛火焰的上方，你会看到纸上有一连串烧焦了的斑点。
Imagine a burning candle, and imagine moving a sheet of heavy paper slowly over the flame of the candle, you're gonna get a series of burned spots in the paper.
想象一下一根燃烧着的蜡烛，再想象一下慢慢把一张很厚的纸移到蜡烛火焰的上方，你会看到纸上有一连串烧焦了的斑点。
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