纵深

wǒ men bì xū tū pò qián yán xiàng zòng shēn tuī jìn

我们必须突破前沿，向纵深推进。

We must break through the forward line and push in depth.

fáng yù zòng shēn

防御纵深

depth of defence

zòng shēn duì xíng

纵深队形

formation depth

gǎi gé zhèng xiàng zòng shēn fā zhǎn

改革正向纵深发展。

Reform is developing in depth.