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Carbon dioxide is a gas. It is produced by animals and people breathing out, and by chemical reactions.
Plants absorb carbon dioxide from the air and moisture from the soil.
植物从空气中吸收二氧化碳，从泥土中吸取水分。 。
Scientists say carbon dioxide and other `greenhouse gases' trap heat in the atmosphere.
科学家们称二氧化碳及其他“温室气体”会把热量存储在大气层中。
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