They come from tar-oils, i. E. Residues from oil refining, which are added to the rubber as p; asticizers, This has the following background是什么意思_They come from tar-oils, i. E. Residues from oil refining, which are added to the rubber as p; asticizers, This has the following background在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句