空隙 kòngxì crack
crack; gap between two objects; gap in time between two events
How to remember 空隙: 空 empty + 隙 crack = crack.
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How it is used
- A gap - in space (两墙之间的空隙 the gap between two walls) or in time (利用工作的空隙 kòngxì, to use a break in work).
- Read kòngxì (kòng = spare/empty); overlaps with 缝隙 (fèngxì, a crack/slit) but 空隙 can be a free interval of time too.
- Common in 见缝插针 contexts - squeezing into small gaps.