When are you going to Japan?

He will help at any time.

Phytobenthos is an important part of the marine ecosystem.

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

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

He started a special exercise to strengthen his plantaris muscle.

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

These shoes have a double sole and are very durable.

His poem depicts a world of nothingness.

He found a way to profit from a difficult situation like fishing at the bottom of a river.