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闭域
閉域
bìyù
1. closed domain
2. algebraically closed field (math.), e.g. complex number field [[複數域|复数域<fùshùyù>]]

Character Breakdown

闭
bì
to shut, to close; to obstruct, to block
HSK 5 6 丶
域
yù
area, district, field, land, region; boundary; domain (in taxonomy)
HSK 5 11 丶

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Chinese