Why is it that as long as someone cheats, many people say Lao Wang next door! What is Lao Wang's business? Why is there Lao Wang next door to the derailment?

This is only because of the previous example, plus a word widely known and accepted by people through word of mouth. Just a representative statement, Lao Wang is the object of the question, just like it is used in mathematics? As an unknown number, σ, A.B. and so on can also be used, which is the conventional view.