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F2_Science_8.2_current
F2_Science_8.1_simple circuit
F2_科學_8.1_簡單電路
F2_science_7.7_Air quality
F2_science_7.6_Balance of oxygen and carbon dioxide in nature
F2_science_7.5_Gas exchange in animals
F2_science_7.4_Gas exchange in plants
F2_science_7.3_respiration
F2_科學_7.7_空氣質素
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