That person is my friend.

It is important for each person to fulfill their role.

He is traveling around the world as an ecologist.

It took a long time to set up the development environment.

We must strive to protect the natural environment.

We should recycle to prevent environmental pollution.

We need to solve the problem in the production environment.

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

We are searching for extraterrestrial life.

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