From time to time a scraper is passed through the pipeline to remove this corrosion.

不时用清管器在油管内穿过，以清除这种锈蚀。

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This corrosion protection specification must be examined by the supplier.

本防腐蚀技术规范必须经过供应商的检查。

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This corrosion protection specification must be examined by the supplier.

本防腐蚀技术规范必须经过供应商的检查。

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