The complete form of I am is I am. The complete form of English means that an English abbreviation can be abbreviated in any way, and it will be drawn together through some letter parts, but abbreviations will also cause trouble, because abbreviations may represent different meanings in different industries. The abbreviation of extended data refers to Chinese words that are shortened and omitted from longer Chinese words for convenience. Abbreviations should be faithful to the original text without changing the theme or central idea of the original text or changing the outline of the original text. It can also be short for a longer name. After abbreviation, you must ensure that the meaning of the word will not be distorted. Some words will become another word after abbreviation.