They started having mail cars on trains and they started having postalsorting on the train.
人们开始用铁路邮政车,并且在火车上分类整理。
2
System of postal-zone codes (zip stands for "zone improvement plan") introduced in the U. S. in 1963 to improve mail delivery and exploit electronic reading and sorting capabilities.
1963年美国为了便于邮件的分拣和投递而采用的邮政编号制。
3
Sorting technologies in postal services, including optical character recognition (OCR), video complement and address check via bar code have reached the world's top level.