The only aging that is performed is the manual tracking of batch numbers for bulk DEF (raw materials) to identify the expiration date of the DEF.是什么意思_The only aging that is performed is the manual tracking of batch numbers for bulk DEF (raw materials) to identify the expiration date of the DEF.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句