语言学理论认为，在各种语言中都有一套各自民族文化传统的礼俗语，它们在结构和用法上定型化；语义上和感情色彩、表现风格民族化；使用场合规范化。英语国家的文化也如此，他们也有一些符合他们文化的礼俗语，这些现成的交际礼俗语在外贸业务中使用相当广泛。礼貌交往是外贸 The theory of linguistics holds that in all languages ​​there is a set of etiquette and customary language of their own national cultural traditions, which are stereotyped in terms of structure and usage; the semantics and emotional color, the expression style are nationalized; and the usage occasions are standardized. The culture of English-speaking countries is also the same. They also have some rituals that meet their culture. These ready-made communication rituals are widely used in foreign trade business. Courtesy is foreign trade