邮政追踪

fast tracking───快速跟进

post and packing───邮寄和包装

fast-tracking───快速跟进

steam cracking───[化工]蒸汽裂化

political backing───政治支持

post and packings───邮递和包装

postage and packing───邮费与包装

thermal cracking───[油气]热裂解

automatic tracking───[自]自动跟踪；[自]自动跟踪仪

Communications: a new tracking device, small enough to be slipped into an envelope, can pinpoint hold-ups within postal services.───通信：一种足够小的可以潜入信封的新型跟踪设备能准确查明邮递管理过程中的停顿信息。