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TPO听力原文：
Geocentric&Heliocentric theory
Narrator Listen to part of a lecture in a history of science class. Aristarchus-Heliocentric Theory Professor
Ok, we have been talking about how throughout history, it was often difficult for people to give up ideas which have long been taken for granted as scientific truth, even if those ideas were false. In Astronomy, for example, the distinction between the solar system and the universe wasn’t clear until modern times. The ancient Greeks believed that what we called the solar system was in fact the entire universe, and that the universe was geocentric. Geocentric means Earth-centered, so the geocentric view holds that the Sun, the planets, and the stars, all revolve around the Earth, which is stationary. Of course, we now know that the planets, including Earth, revolve around the Sun, and that the solar system is only a tiny part of the universe.
TPO听力原文翻译：
我们已经讨论过，纵观历史，当人们要放弃长久以来已经被理所当然地视为科学真理的观点，是如何的困难，即使这些观点是错的。例如，在天文学上，太阳系和宇宙的差别直到现代才分清楚。古希腊人认为我们现在所称的太阳系就是整个宇宙，而且整个宇宙是“地心”的。“地心”的意思就是以地球为中心，因此地心论认为太阳、行星和恒星都围绕静止的地球转动。我们现在当然知道，行星，包括地球，都围绕太阳转动，而太阳系也只是宇宙很小的一部分。
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