I recommend getting vaccinated against hepatitis A.

It was confirmed that he was infected with hepatitis B.

His words carry importance.

The military officer attached to the embassy plays a crucial role in gathering military information of that country.

Ceremonial family occasions are traditional family events in Japan.

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.

This eigenfunction is one of the fundamental concepts of quantum mechanics.

The poster girl of that shop is very kind and always welcomes customers with a smile.