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开区间
開區間
kāiqūjiān
1. open interval (in calculus)

Character Breakdown

开
kāi
to open; to start, to initiate, to begin
HSK 1 4 丶
区
qū
area, district, region, ward; surname
HSK 4 4 丶
间
jiān
between, among; midpoint; space, place, locality
HSK 2 7 丶

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Category
Chinese