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to use one's head
You need to use your head to solve this problem.
a pendulum clock
My grandfather likes to repair old pendulum clocks.
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.
(mathematics) quod erat demonstrandum (that which was to be proved)
He declared the project to be proven and finished.
certificate
You need to submit a certificate.
global warming
Global warming is a big issue that affects all of us.
(geology, physics) geophysics
He is an expert in geophysics.
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