He continued his journey to the west.

General relativity is a theory of physics proposed by Einstein.

He is a world-renowned biologist.

We conducted a spectral analysis to investigate the spectral characteristics of this substance.

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.

I love the class of reading Chinese classics in Japanese.

I studied Classical Chinese in university.