A: The form of noun explanation is more flexible. For example, modifying short answer questions or essay questions may become a noun explanation. In fact, when preparing noun explanations, you don't need to memorize them. When preparing the explanation of nouns, we must clearly explain the time, scope and nature of nouns. Explaining in one sentence is equivalent to putting a hat on it and then explaining the details in detail, just like putting on clothes and finally explaining this "noun".

For example, use "standard system" to explain nouns.

Canon system: also known as canon system, canon history book, centering on canon system, records the canon system of past dynasties and its historical book genre developed due to the gains and losses of reform. (upper limit)

Its characteristic is classification, and the representative canon system is Tong Dian, edited by Liu Zhiji in Tang Dynasty. (dressing)

The emergence of canon system enriches the genre of China's history books, records the canon system of past dynasties, and provides more historical materials for historical research. (boots)

Through examples, we can classify such topics as noun explanations. The explanation of general nouns comes from political system, economic specialization, culture and so on. Therefore, when explaining nouns, the first sentence must point out the basic factors such as the nature and time of appearance. Even if you can't remember its details or influence, you can still have something to say.