HSK V7-9
Correct

界线

/ jièxiàn / 
Strokes

Definition

limits/bounds/dividing line

Example

As a Noun

boundary line

1
Wǒmen
我们
zhījiān
之间
yǒuzhe
有着
wúxíng
无形
de
的
jièxiàn
界线
  
。

There is an invisible line between us.

2
Yòng
用
shíkuài
石块
zuō
作
jièxiàn
界线

demarcate by pieces of stone

3
Chāoyuè
超越
jièxiàn
界线

get across the boundary line

As a Noun

edge; verge; brink