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.

Suzuran is my best friend.

I eat an egg every morning.

The nimbostratus clouds covered the sky, and it started to rain.

The market fell into disorder due to that news.

His attitude was rude, making people uncomfortable.