Wiki上關于pig的解釋中,其中一條是:
(engineering) A device for cleaning or inspecting the inside of an oil or gas pipeline, or for separating different substances within the pipeline. Named for the pig-like squealing noise made by their progress. 參見http://en.wiktionary.org/wiki/pig
粗譯:(工程領域)一種用于清理或者檢測油氣管道設備,或用于分隔管道內不同的介質。因其在操作過程中產生類似于豬的振鳴聲而得名。