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xenobiology (speculative biology of extraterrestrial life)
Astrobiology is a very interesting field of study.
negation / prohibition
Sena was born prematurely.
(geology, physics) geophysics
He is an expert in geophysics.
biologist
He is a world-renowned biologist.
an unidentified flying object
He claims to have seen an unidentified flying object.
(physics) momentum / (sports) amount of physical activities
In physics, momentum is defined as the product of the mass and velocity of an object.
tool; a hand tool; gadget / (stage, film) prop; stage property
He is preparing the props to use on stage.
(stage, film) scenery; stage setting; set
Carrying the stage props of the theater company is a tough job.
a regular verb
Regular verbs are relatively easy to learn.
an irregular verb
Learning irregular verbs is difficult.
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