He naturally demonstrated leadership.

He treats us as a big friend.

We had a picnic in the forest park over the weekend.

Last night, the town was hit by a conflagration.

The fire alarm went off, so we immediately evacuated the building.

He is traveling around the world as an ecologist.

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

We should recycle to prevent environmental pollution.

We need to solve the problem in the production environment.

I am very interested in natural science.