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http://www.scientificamerican.com/article/new-close-ups-of-pluto-and-charon-present-puzzle-for-scientists/
您即将离开知乎,请注意您的帐号和财产安全。
http://www.scientificamerican.com/article/new-close-ups-of-pluto-and-charon-present-puzzle-for-scientists/