名词短语
中文翻译：管道线路的外层涂层
同义词：
['pipe line exterior coating', 'pipeline exterior coating']
例句：
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1. The newpipeline system will greatly improve the efficiency of oil transportation.
新的管道系统将大大提高石油运输的效率。
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2. The exterior coating of the pipeline is made of high-quality polyethylene.
该管道的外层涂层是由高质量的聚乙烯制成的。
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3. The exterior coating of the pipeline plays a crucial role in protecting the pipeline from corrosion.
管道外层涂层在保护管道免受腐蚀方面起着至关重要的作用。