Correct

隔绝

/ géjué / 
Strokes

Definition

isolated (from the world)/disconnected

Example

As a Verb

cut off; isolate; separate; obstruct; insulate

1
Zhège
这个
guójiā
国家
zēng
曾
yīdù
一度
yú
与
wàibù
外部
shìjiè
世界
géjué
隔绝
  
。

The country once cut itself off/isolated itself/sealed itself off/insulated itself from the outside world.

2
Zài
在
shānlǐ
山里
guò
过
zhāo
着
wánquán
完全
yúshìgéjué
与世隔绝
de
的
shēnghuó
生活

live in complete isolation in a mountain

3
Yīnxìn
音信
géjué
隔绝

have not heard from each other/sb; (with) all news blocked off

4
Yú
与
wàijiè
外界
géjué
隔绝

be hedged off from the outer world; be cut/shut off from the outer world

5
Géjué
隔绝
kōngqì
空气
  
/
zàoshēng
噪声

seal out air/noise