Yesterday our headmaster made a speech on environmental protection, and we learned something about recycling of waste.
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其它研究解释了生物圈内的碳氧循环、高碳环境中的植物生理、废物治理和农业技术。
Other research described carbon and oxygen cycles within the sphere, the physiology of plants in a high-CO2 environment, waste remediation and agricultural techniques.
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