其间 qíjiān in between
in between; within that interval; in the meantime
How to remember 其间: 其 this or that + 间 room = in between.
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How it is used
- During that period, or in between - 会议持续三天，其间讨论了多项议题 (huìyì chíxù sān tiān, qíjiān tǎolùnle duō xiàng yìtí) the meeting lasted three days, during which many topics were discussed.
- Literary/written; refers back to a time span just mentioned. Roughly 'in the meantime / within that interval,' not a standalone 'between two objects.'