I have been to France once.

He finished all his work all at once.

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

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

I am an Earthling.

We are searching for extraterrestrial life.

I have recently started a new job.

Today's temperature is 30 degrees.

He redid the job three times.

This angle is 90 degrees.