“邮票”在《现代汉语词典》中释义为：“邮局发卖的、用来贴在邮件上表明已付邮资的凭证”，其范围明显过于狭隘；在《中国邮电百科全书》中释义为：“由国家（或地区）邮政主管部门发行的、用于邮资纳费标志的有价证券”。在论述邮票的作用时指出邮票的基本功能是邮资凭证， “Stamps” is defined in “Modern Chinese Dictionary” as “the vouchers issued by the post office to indicate the postage paid on the postal mail”, the range of which is obviously too narrow; the definition in “China Postal Encyclopaedia” is: “Securities issued by the competent postal service of the country (or area) for the postage payment mark”. When discussing the role of stamps, he pointed out that the basic functions of stamps are postage vouchers,