In order to survive in this ever-changing world, it is necessary to constantly continue learning new knowledge.

You can see drift ice in the Sea of Okhotsk in winter.

He was standing on the seashore, staring at the distant horizon.

He gained sailing experience in the Arabian Sea.

When summer vacation comes, I go to the sea every day wearing swim trunks.

These shoes have a double sole and are very durable.

The ecosystem of zoobenthos is an important field of study 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.