HSK V7-9
Correct

纵深

/ zòngshēn / 
Strokes

Definition

depth (from front to rear)/depth (into a territory)/span (of time)/(fig.) depth (of deployment, progress, development etc)

Example

As a Noun
depth
1
Zòngshēn
纵深
zǔjié
阻截

deep interdiction of sth

2
Zòngshēn
纵深
fángyù
防御

defence in depth

As a Noun
higher level
3
Xiàng
向
zòngshēn
纵深
fāzhǎn
发展

develop in depth