Why do many countries recommend China traditional wok cooking?

Because there is iron in the wok, if vinegar is added to stir-fry or stir-fry, iron reacts with acid to generate salt containing iron ions, which is easy to be absorbed by the human body and easy to supplement iron, which is good for human health. It was mentioned in the third grade chemistry book of Hunan Education Edition. By the way, I just graduated from grade three. Upstairs, iron supplementation is correct. Remember to add more vinegar when cooking.