以下为句子列表：
英文: Article 29 People's governments of large or medium-sized cities shall make plans for catering service enterprises to start the use of clean energy such as natural gas, liquefied petroleum gas and electricity within a prescribed time limit.
中文: 第二十九条大、中城市人民政府应当制定规划，对饮食服务企业限期使用天然气、液化石油气、电或者其他清洁能源。
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英文: Article 38 Urban people's governments shall, in a planned way, improve the composition of fuel, and develop coal gas, natural gas, liquefied gas and other clean energy for use in urban areas.
中文: 第三十八条城市人民政府应当有计划地改进燃料结构，发展城市煤气、天然气、液化气和其他清洁能源。
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英文: Biogas generated from the sludge digestion in wastewater treatment plants is a potential clean energy source, which can be recycled in several ways.
中文: 摘要城市污水处理厂中污泥厌氧消化产生的沼气是一种很有潜力的清洁能源。
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英文: China would “need time” to catch up with the US, Europe and Japan in the use of clean energy technology, he said.
中文: 他表示，在清洁能源技术的使用上，中国“需要一定的时间”来赶上美国、欧洲和日本。
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英文: For the time being, clean energy is competitive in only a few countries in certain specific instances: solar power for retail electricity consumers in Japan, say, or ethanol made from sugarcane in Brazil.
中文: 在开始的阶段，清洁能源只是在一些国家的特定事例里有竞争力：太阳能发电在日本的电力零售消费者，另如说，巴西从蔗糖中提炼乙醇。
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