HSK C1/W1
Correct

介

/ jiè / 
Strokes

Definition

to introduce/to lie between/between/shell/armor

Example

As a Verb
lie between; be situated between; interpose
1
Jièyú
介于
liǎngzhě
两者
zhījiān
之间

be situated between the two

As a Verb
introduce briefly; give a brief introduction
As a Noun
thing or person that lies in between
As a Verb
mind