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a bounded area, a sphere, a region / (mathematics) category
This park is a no-smoking area.
air pollution
Air pollution is having a serious impact on the health of the planet.
exposing oneself to fresh outside air
I maintain my health by exposing myself to fresh outside air every morning.
to expose oneself to fresh outside air
an Earthling; a Terran
I am an Earthling.
extraterrestrial area
We are searching for extraterrestrial life.
terraforming (planetary engineering)
The process of terraforming is part of transforming other planets into a habitable environment for humans.
earth science
Earth science is an important field of study for unraveling the mysteries of nature.
the wealthy, the rich
Wealthy people often dine at high-end restaurants.
the middle class
The living standard of the middle class is positioned between the poor and the wealthy.
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