介于 jièyú between
between; intermediate; to lie between
How to remember 介于: 介 between + 于 at = between.
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How it is used
- To lie between two points/values - 气温介于十度和二十度之间 (qìwēn jièyú shí dù hé èrshí dù zhījiān) the temperature is between 10 and 20 degrees.
- Formal; the frame is 介于 A 和 B 之间 (between A and B). Used for ranges, categories, positions.
- More written than plain 在...之间 (zài...zhījiān); 介于 stresses an intermediate, in-between status.