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About mass spectrometry results of 5,475
找不到喜歡的影片嗎？你也能自己匯入影片喔
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02:34
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04:48
Will Betelgeuse Explode? This Is What Scientists Know So Far
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Escalators: We're Not Doing it Wrong (Mostly)
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California police say Monterey Park gunman found dead after killing 10 - BBC News
8
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18:05
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4976
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845
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19
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15
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