Some adults get sick and recover without noticing, until their children get infected and the children show more severe symptoms. It's only when they're taken to the hospital for examination that they find out the whole family is positive.
When talking about a disease, you need concrete evidence. Simply speculating based on age groups is the least reliable and cannot be considered evidence.
The male student said, "There is a shadow of a nodule on the X-ray."
What!
A large group of people all turned to look at the X-ray in unison.
The student who spoke was feeling proud of himself, thinking he was the first to spot the issue. But when he glimpsed Teacher Cao's lips curling as if in a smile, his body stiffened, and he was dumbfounded.
Doctor Cheng Yuchen and Cao Zhao could both guess what was happening, their eyelids rolling up to reveal the whites of their eyes.
"It's not a nodule," Zhang Desheng said. "It's the shadow of both nipple tips, okay."
