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Alternative spelling of 蜘蛛恐怖症 (“arachnophobia”)
He has arachnophobia, and he panics as soon as he sees a spider.
coulrophobia
He has coulrophobia, so he can't go to the circus.
(set theory) intersection / (set theory) direct product
In math class, I learned about the concept of intersection.
(set theory) relative complement
In math class, the teacher explained the concept of relative complement.
(set theory) union
In math class, we learned about the concept of union.
(set theory) absolute complement
The concept of the absolute complement plays an important role in set theory.
set theory
He wants to learn deeply about set theory.
(set theory) set operation
Set operation is one of the basic concepts in mathematics.
collective noun
He is learning how to use collective nouns.
(mathematics) empty set
In mathematics, an empty set refers to a set that does not contain any elements.
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