HSK 7-9
区间
qūjiān名
delimited area; defined section of a train or bus route; numerical range; (math.) interval
票价在合理区间内浮动。
Piàojià zài hélǐ qūjiān nèi fúdòng.
Ticket prices fluctuate within a reasonable range.
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Appears across levels (7-9) in the HSK 3.0 word list.