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.

These shoes have a double sole and are very durable.

The ecosystem of zoobenthos is an important field of study in marine biology.

The study of benthos is an important field in marine biology.

Phytobenthos is an important part of the marine ecosystem.

He started a special exercise to strengthen his plantaris muscle.

He is a frog in a well, not understanding how vast the world is.