He decided to let the water carry away his past failures.

Sun-warmed water is water warmed by the sunlight.

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.'