4 sentences for 奋战 (fèn​zhàn — struggle)

1. 医护人员奋战在一线。

   yī​hù rén​yuán fèn​zhàn zài yī​xiàn.

   Medical staff are fighting on the front lines.

   Source: Dong Chinese Dictionary

2. 全体员工正为完成任务而昼夜奋战。

   quán​tǐ yuán​gōng zhèng wèi wán​chéng rèn​wu ér zhòu​yè fèn​zhàn.

   All staff are working hard day and night to complete the task.

   Source: Dong Chinese Dictionary

3. 医生们始终奋战在抗击疫情的第一线。

   yī​shēng men shǐ​zhōng fèn​zhàn zài kàng​jī yì​qíng de dì​yī​xiàn.

   Doctors have always been fighting on the front lines against the pandemic.

   Source: Dong Chinese Dictionary

4. 广大公安干警日夜奋战在维护社会治安的第一线。

   guǎng​dà gōng'ān gàn​jǐng rì​yè fèn​zhàn zài wéi​hù shè​huì zhì'ān de dì​yī​xiàn.

   The vast ranks of public security officers fight day and night on the front lines of maintaining social order.

   Source: Dong Chinese Dictionary