People usually has some kind of pneumonia there, maybe a person as a small child had a pneumonia there, It involves some kinds of devastating pneumina like staphylococcus pneumonia and tuberculosis pneumonia and it destroyed the bronchi because of the infection, staphylococcus pneumonia is a typical one, it destroy the bronchi, these bronchi are dilated permanently, permanently dilated, they get infected, and as they get more infection there because they permanently dilated, so they are not functioning, for they get more infection there, the more infections bring more bronchiectasis, and more bronchiectasis bring more infections there, so this is like vicious circle.