名词短语
中文翻译：Unknown
同义词：
['primary source of electricity', 'primary power source']
例句：
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1. The main sourceof the city's energy comes from renewable sources.
该城市的主要能源来自可再生能源。
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2.The main source of the company's profits is its sales.
公司利润的主要来源是其销售。
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3. The main source of the problem lies in the lack of proper maintenance.
问题的主要根源在于缺乏适当的维护。