Umi is my best friend.

He found the sea on an old map.

He found the sea on an old map.

I love swimming at the seashore.

I often go to the sea on weekends.

Earth science is an important field of study for unraveling the mysteries of nature.

I am an Earthling.

We are searching for extraterrestrial life.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

I live in Shenzhen.