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Synonym of ペルム紀
The Triassic period is one of the geological ages, referring to the period from about 252 million years ago to about 251 million years ago.
secondary
He was affected by secondary effects.
two-dimensional array
This two-dimensional array represents students in each row and subjects in each column.
(algebra) binary operation
Binary operation is one of the basic concepts in algebra.
(chemistry) silicon dioxide
Silicon dioxide is a major component of glass and ceramics.
a hendecagon
He drew a hendecagon shape.
party trick
His party trick is perfect for livening up the party.
(history, socialism, communism, anarchism) the First International
The First International was an international organization of workers.
symmetrical pair, left and right pair
His shoes are a symmetrical pair, perfectly matching left and right.
pure / honest / straight-forward
His painting expresses pure beauty.
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