3 sentences

1. 部队向敌方领土纵深推进。

   bù​duì xiàng dí​fāng lǐng​tǔ zòng​shēn tuī​jìn.

   The troops advanced deep into enemy territory.

   Source: Dong Chinese Dictionary

2. 这部作品展示了宏大的历史纵深。

   zhè bù zuò​pǐn zhǎn​shì le hóng​dà de lì​shǐ zòng​shēn.

   This work displays a grand historical depth.

   Source: Dong Chinese Dictionary

3. 两国的经济合作正在向纵深发展。

   liǎng guó de jīng​jì hé​zuò zhèng​zài xiàng zòng​shēn fā​zhǎn.

   Economic cooperation between the two countries is developing in depth.

   Source: Dong Chinese Dictionary