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Watch Later 15:05

4.1_1_地球的表面

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4.1_1_荒漠與熱帶雨林

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4.1_2_大地震怒

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4.1_2_四川地震救援的人性光輝

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4.1_3_中華民族面面觀

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4.1_3_思想文化的傳承

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4.1_4_放眼世界

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4.2_1_水的三態

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