... clean the grease and stain 清理油圬 grease stain of pipeline 管道油垢 grease stain of skin 油板皮 ...
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grease stain of pipeline
管道油渍
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The principle and experiments on the measurement of grease stain in petroleum pipeline using the thermal neutron gauge were reported.
叙述了利用热中子透射计测石油管道内油垢厚度的原理、实验和结论。
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