His grandfather was a member of the Imperial Navy during World War II.

According to Chinese mythology, the creation of heaven and earth represents the beginning of the universe.

This detergent contains a high-quality surfactant.

Developmental dictatorship can bring about economic growth, but there are also issues of human rights violations.

The effect of this medicine is amazing.

General relativity is a theory of physics proposed by Einstein.

Special relativity is one of the fundamental theories of physics.

This area is seriously contaminated with radioactive isotopes.

He feels dizzy when he stands up suddenly due to orthostatic hypotension.

My father was diagnosed with ankylosing spondylitis.