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Watch Later 3:39

F2_science_7.7_Air quality

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F2_science_7.6_Balance of oxygen and carbon dioxide in nature

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F2_science_7.5_Gas exchange in animals

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F2_science_7.4_Gas exchange in plants

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F2_science_7.3_respiration

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F2_科學_7.7_空氣質素

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F2_科學_7.6_大自然氧和二氧化碳的平衡

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F2_科學_7.5_動物的氣體交換

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F2_科學_7.4_植物的氣體交換

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