8 sentences

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. 战士们在前方英勇奋战。

   zhàn​shì men zài qián​fāng yīng​yǒng fèn​zhàn.

   The soldiers are fighting bravely on the front lines.

   Source: Dong Chinese Dictionary

3. 你们都英勇奋战了。

   nǐ​men dōu yīng​yǒng fèn​zhàn le.

   You have all fought valiantly.

   Source: OpenSubtitles

4. 将士们在战斗的第一线英勇奋战。

   jiàng​shì men zài zhàn​dòu de dì​yī​xiàn yīng​yǒng fèn​zhàn.

   The soldiers fought bravely on the front lines of the battle.

   Source: Dong Chinese Dictionary

5. 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

6. 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

7. 他身上的伤疤是曾经英勇奋战的证明。

   tā shēn​shang de shāng​bā shì céng​jīng yīng​yǒng fèn​zhàn de zhèng​míng.

   He bears scars that show how bravely he fought.

   Source: OpenSubtitles

8. 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