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加速實驗
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08/21/2011
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Thaumatrope
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08/18/2011
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Building circuits
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26 views
08／11／2011
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Magnet fishing
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84 views
08/09/11
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Periodic Table
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26 views
6/19/2011
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Elements card
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33 views
06/08/11
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translation
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22 views
5/29/2011
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ETC
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26 views
05/28/2011
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Mitochondria
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21 views
05/13/11
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antibody
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09/21/2010
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