1, pre is short for presentation. Pre for college students is a process of input first and then output. This process can be seen as a process of reorganizing knowledge and truly internalizing and absorbing oneself.

2, knowledge is in line with the direction of civilization, the sum of human exploration results of the material world and the spiritual world. So far, there is no unified and clear definition of knowledge. But the criterion for judging the value of knowledge lies in practicality, considering whether human beings can create new substances and gain strength and motivation. Plato has a classic definition: a sentence can be called three conditions that knowledge must meet. It must be verified, correct and convincing. This is also the standard to distinguish between science and non-science.

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