The adult son who still lives at home is causing trouble for his parents.

The room rent is too high, so I'm looking for a new apartment.

A ping-pong infection occurred at school, causing many students to take time off.

Oral infection is when pathogens enter the body through food or drink.

It is important to identify the source of infection.

To prevent infection, don't forget to wash your hands.

I like writing letters on this beautiful letter paper.

The infectious capacity of this virus is very strong.

The number of people infected with the new coronavirus is rapidly increasing.

That man-child is still living in his parents' house.