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Watch Later 3:55

I.S. ch1.3 Preview one

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I.S. ch1.2 Preview two

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I.S. ch1.2 Preview one

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I.S. ch1.4 預習二

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I.S. ch1.4 預習一

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I.S. ch1.3 預習二

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I.S. ch1.3 預習一

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I.S. ch1.2 預習二

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I.S. ch1.2 預習一

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