this article is from WeChat official account: < span > ID: kexuedayuan < / span > < / a > < span >, written by Wang Zheng, head photo: visual China < / span >
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Why does comet drag a long tail?
this article is from WeChat official account: < span > ID: kexuedayuan < / span > < / a > < span >, written by Wang Zheng, head photo: visual China < / span >
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