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标签: informal
以下是与 "informal" 标签相关的所有文章。
- An invitation letter is a kind of social letter，it is divided into formal invitation and informal invitation.。
- “Howdy!” This is a very informal abbreviation of “ How do you do？”
- （） are very informal words used especially by particular groups of people.
- （） are usually used in casual and informal conversation.