A proposition consists of a proposition and a conclusion. A proposition is a known thing, and a conclusion is something derived from the known thing.

A proposition can often be written in the form of "if … then ……", in which the part after "if" is the proposition and the part after "then" is the conclusion.

The above sentence is a general statement, which cannot be written in the form of "if" ... and then ... "has no judgment meaning, so it is not a proposition.