Why is this syllogism wrong?

A syllogism must have only three different concepts. Therefore, it is necessary to make the three concepts in syllogism point to the same object and have the same extension in two repetitions. Violating this law will make four conceptual mistakes. The so-called mistake of four concepts refers to the emergence of four different concepts in a syllogism. The mistakes of the four concepts are often caused by the different concepts as projects. For example, universities in China are distributed all over the country; Peking University is a university in China; So Peking University is distributed all over the country. The conclusion of this syllogism is obviously wrong, but its two premises are true. Why does a wrong conclusion come from two real premises? The reason is that item ("University in China") is different, and there are four conceptual errors. That is, the word "China University" has different concepts on two premises. On the premise, it represents the whole university in China and an established concept. In the minor premise, it can refer to a domestic university, which means not the concept of collection, but a general concept. So, when it appears twice, it actually represents two different concepts. In this way, taking it as a Chinese word, it is impossible to inevitably associate big words with small words, so as to draw a correct conclusion. See /view/33888.htm for details.