A surprised expression was on his face.

He looks very young-looking.

He is an expert in immunology.

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.

He proposed a complete reform.

There is a meeting tomorrow that everyone will participate in.

He took over the policy of the previous president.