In this chemical reaction, hydration plays an important role.

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

The prevention of venereal diseases is most important in safe sexual behavior.

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

Anthropozoonosis, or animal-derived infectious diseases, have the potential to spread between humans and animals.

Since he started his new job, he's been lively as if he were a fish back in water.

He absorbs new information like a sponge soaking up water.

The European water vole is a small mammal native to Europe.

This steam is what you see when water vapor cools down.

This building is equipped with an impermeable wall, preventing water intrusion.