First, the decline of young people's physical fitness. With the popularity of smart phones, most of the entertainment life of contemporary young people is spent on mobile phones. Or play games or brush dramas or chase variety shows or chat, of course, some people will regard mobile phones as understanding major events at home and abroad. "Ge You paralysis" is the holiday norm of contemporary decadent youth. Especially in summer, it is hot enough to melt people outside. It is beautiful to eat watermelon, drink cold drinks and play with mobile phones in an air-conditioned room, and there is no window ventilation. In the long run, fat keeps accumulating, people don't exercise, and their resistance drops.
Second, the public environment is unsanitary. Although there will be special personnel to clean it regularly, it is inevitable that the cleaning will not be clean, the dust will fly around, and people with low moral quality will spit everywhere, making the public environment worse. China is also a populous country, and the proportion of young people going abroad is still very large. No matter where it is, it is a sea of people. There will inevitably be conversations and exchanges between people, and saliva will splash. Well, this is worrying.
Third, the infectivity of tuberculosis. Once a young man is infected with tuberculosis, people living around him are at great risk of contracting tuberculosis. As rumored, there is no way to isolate the source of infection, so the chance of getting tuberculosis is much greater.