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(physics) terminal velocity
When an object is in free fall, its terminal velocity is determined by the balance between gravity and air resistance.
The International System of Units, SI.
The International System of Units is a standard of measurement widely used around the world.
an orangutan
An orangutan is a very intelligent animal.
Bhutan (a country in Asia)
I want to go to Bhutan.
detection dog
Detection dogs are trained to find explosives.
(linear algebra) identity matrix
An identity matrix is a square matrix in which all the elements on the diagonal are 1 and all other elements are 0.
a short novel, novella, short story
He is good at writing short novels.
fresh water
This lake is filled with fresh water.
coal
He works digging out coal.
a word, a shortest part that means something in a sentence
It's difficult to remember new words.
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