He suffered for a long time due to tabes dorsalis.

Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in petrology at university.

He is an expert in tidology, studying the fluctuations of the sea's tides.

This beautiful zoisite necklace is my favorite.

This fossil is made of carbon.

We conducted a meta-analysis on this issue.

Rin always acts based on ethics.

He finally accomplished the project.

He is the leader of that team.