How is the steel of 100,000 jokes tempered?

Lao Wang is an old worker in a steel factory.

Skilled in technology and outstanding in performance, he is a model worker in the factory.

After retirement, he sent his son to work in the smelting workshop of the factory by virtue of his relationship.

But his son always makes mistakes in operation and is often criticized by the leaders.

Lao Wang was very angry when he learned that, so he went to the bookstore and bought a book.

"How steel was tempered", violently fell in front of his son:

If I don't study my business more, where do you want my old face to look? ~~~~