The living standard of the middle class is positioned between the poor and the wealthy.

His story, after a caesura, started again.

The potential energy of this ball is proportional to its height.

His usual location is the seat at the very back of the library.

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.

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

He fractured his intermediate cuneiform bone in his foot.

He is doing a special exercise to strengthen his vastus intermedius muscle.