On one occasion, when answering how college students realize their personal value, Yu said, "Many people have two pursuits in their lives, one is to be rich and the other is to be valuable. ..... money is not necessarily valuable, and valuable people will have money sooner or later. " He added: "students should not turn themselves into piggy banks, because no one can get rich by saving money;" But we must turn ourselves into a' printing machine', and we can always rely on our own ability to get money when needed. But if you want to make yourself valuable, it is only possible to endure hardships, work hard and struggle. The more valuable you are, the greater your value and the greater your contribution to society. " After that, the audience applauded.

From the perspective of language expression, what are the characteristics of this passage of Mr. Wang?

A: Two novel and unique metaphors vividly illustrate the abstract problem of personal value.