哥白尼说我应该让他们明白地球是圆的。
Copernicus said "We should bring home to them the earth is round."
在1543年，波兰天文学家哥白尼说，地球和所有其他所有的行星都围绕太阳转。
In 1543, the Polish astronomer Nicolaus Copernicus said that the Earth and all of the other planets revolve around the Sun.
人们并不清楚哥白尼什么时候产生日心说的想法，他也并不是第一个有这种想象的人。
It is not known when the idea of a sun-centred cosmology came to Copernicus.
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