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同学们知道,在光合作用下,植物是制造氧气的工厂,但夜间没有光线,光合作用也就停止了,这时植物在呼吸时就吸收大量氧气,排出二氧化碳,污染居室。
Students know that under photosynthesis, plants are the factories that make oxygen. But at night there is no light and photosynthesis stops. At this time, plants absorb large amounts of oxygen while breathing and discharge carbon dioxide to pollute the living room.