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並前往https://www.nbcnews.com/science/weird-science/25-billion-t-rex-roamed-earth-not-study-finds-rcna694

2.5 billion T. rex roamed Earth, but not all at once, study finds

The species roamed North America for about 1.2 million to 3.6 million years, meaning the T. rex population density was small at any one moment.

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