“启”作为一个常用字,有多个义项:本义是开,即用手打开单扇门的户;引申义为开口说话,即陈述告知之意:又可作为应用文的文种之一。同一个“启”字,其不同义项,在应用文中有着多种不同的用法,应小心不要混淆。一是作为启封语的“启”。启封语是指在信封上请收信人打开信封的礼貌语。例如:“×××先生台 ”Kai “ as a commonly used word, there are several senses: the original meaning is open, that is, open the door with a single door; extended meaning of the opening to speak, that is, to declare the meaning of the statement: . The same ”Kai“ word, its different meaning, in the application of the text has a variety of different uses, be careful not to be confused. First, as the Kai language ”Kai“. Enveloping is the polite expression of asking the recipient to open an envelope on the envelope. For example: ”Mr. × × × Taiwan