自然环境保育（Preservation of the natural environment） (a)处理有机废弃物：食物残肴与人体排泄物可制成肥料，做为种植作物之有效 用途。
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Environmentalists are people who advocate the preservation of the natural environment.
环境主义者是倡导保护自然环境的人。
Chapter two analyzes the city, s natural and social environment, s historical changes and the city, s structure, s transformation, and points out the present problems in the preservation of the city.
第二章：分析了名城开封的自然、社会环境的历史变迁以及开封形态的演变因素，指出了当今开封名城保护存在的问题。
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