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.

Reverse Polish notation is one method of expressing calculations.

This butterfly valve is used to control the flow of fluid.

Diseases of the mitral valve greatly affect the function of the heart.

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

The Reverse Address Resolution Protocol is a protocol for obtaining host names from IP addresses.

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.