区间 qūjiān delimited area
delimited area; defined section of a train or bus route; numerical range; (maths) interval
How to remember 区间: 区 area + 间 room = delimited area.
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How it is used
- An interval/range between two bounds - 价格区间 (jiàgé qūjiān) a price range; 数学区间 a math interval.
- Also a defined segment of a transit route: 区间车 a shuttle running part of a line.
- Technical/neutral; marks a bounded stretch (numeric, spatial, or route).