He is relaxing by smoking a hookah.

Mizutsukasa is my best friend.

Mizutsukasa is my best friend.

The flow of the Wei River is quiet and beautiful.

There is a lot of spirogyra floating in this pond.

In this chemical reaction, hydration plays an important role.

This area is rich in subterranean rivers, which serve as a source of groundwater.

He was my student, but now he has become so proficient that it can be said 'the student has surpassed his teacher.'

When he immigrated to a new country, he remembered the proverb 'When in Rome, do as the Romans do' and tried to adapt to the culture of that country.

There is a proverb that says, 'When in Rome, do as the Romans do,' so let's follow the customs of Rome when we are there.