The terms commonly used in a business letter
商业书信中常用术语 1. Private 私人信件2. Personal 亲收3. Confidential 机密 4. Secret 密件5. Top secret 绝密6. Ordinary Mail 平信7. Immediate or Urgent 急件8. Registered (Reg.) 挂号9. Express 快信10. Via (by) Air Mail 航空11. Printed Matter 印刷品12. Sample Post 样品邮件13. Samples of Merchandise 货物样品14. With Parcel (packet) 另附包裹15. Re: 主题（即文件名）16. Enclosure(s) or, Enc. or, Encl. 附件17. P.S. (postscript) or N.B. (note well) 附言、再启18. att: (attention) 收件人19. c.c.（carbon copy）or, copy to 副本20. c/o (care of) 转交