His face was full of happiness.

My younger brother caught the influenza.

I recommend getting vaccinated against hepatitis A.

It was confirmed that he was infected with hepatitis B.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

This software has backward compatibility.

It's difficult to understand the context of this sentence.

My scientific calculator can perform very advanced calculations.

Spray drying is a method of dispersing a liquid into fine particles and drying them.

He is an expert in international relations.