Subject + 介于 + A + 和 + B + 之间
介于 (jièyú) means 'to be in between' or 'to fall between' two things and is used to describe something that occupies a middle position. The structure 介于 A 和/与 B 之间 places the subject between two reference points, whether in terms of flavor, quality, size, or degree.
乌龙茶的口味介于绿茶和红茶之间。
wūlóngchá de kǒuwèi jièyú lǜchá hé hóngchá zhījiān.
The flavor of oolong tea falls between green tea and black tea.
这个城市的气温介于二十度和三十度之间。
zhè gè chéngshì de qìwēn jièyú èrshí dù hé sānshí dù zhījiān.
The temperature in this city ranges between twenty and thirty degrees.
他的水平介于初级和中级之间。
tā de shuǐpíng jièyú chūjí hé zhōngjí zhījiān.
His level is between beginner and intermediate.