哥白尼的第一个推测出现在印于1514年前的一本40页的小册子上，他把小册子分发给了他的一些朋友和同事。
Copernicus's first speculations on the subject appear in a 40-page booklet printed before 1514, which he circulated to some friends and colleagues.
试想我们拥有的信息比四百年前的哥白尼多了多少。
Think how much more information we have than Copernicus had four centuries ago.
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