3 sentences

1. 公司决定收缩战线，专注于核心业务。

   gōng​sī jué​dìng shōu​suō zhàn​xiàn, zhuān​zhù yú hé​xīn yè​wù.

   The company decided to scale back and focus on its core business.

   Source: Dong Chinese Dictionary

2. 全国教育战线都在深入学习新的政策。

   quán guó jiào​yù zhàn​xiàn dōu zài shēn​rù xué​xí xīn de zhèng​cè.

   The entire education sector across the country is studying the new policies in depth.

   Source: Dong Chinese Dictionary

3. 敌军突破了我们的第一道战线。

   dí​jūn tū​pò le wǒ​men de dì​yī dào zhàn​xiàn.

   The enemy broke through our first line of defense.

   Source: Dong Chinese Dictionary