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 old radio uses a cold-cathode tube.

The launch of intercontinental ballistic missiles has become an international issue.

It is said that secondhand smoke has a negative impact on health.

Topology is a branch of mathematics that abstracts and generalizes the concept of space.

He was infected with hepatitis E.

He is receiving treatment for hepatitis C.