He emphasized the importance of class struggle.

My back pain improved after I went to a chiropractor.

He is deeply involved in the animal liberation movement.

We are focusing on the research and development of new products.

The Kuiper belt is located on the outer edge of the solar system.

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.

The effect of this medicine is amazing.

Alkaline earth metals are one of the main components of the earth's crust.