Because her immune system is weak, she catches a cold easily.

I am majoring in immunology at university.

He is dedicated to the study of immunochemistry.

People with strong general immunity are less likely to catch a cold.

Mucosal immunity plays a crucial role in protecting our bodies from pathogens.

I went to see a movie by myself.

Watching a movie alone is enjoyable.

That person is my friend.

He is truly a wonderful person.

There are 20 students in our class.