6 sentences

1. 经理努力重振员工的士气。

   jīng​lǐ nǔ​lì chóng​zhèn yuán​gōng de shì​qì.

   The manager is trying hard to boost the employees' morale.

   Source: Dong Chinese Dictionary

2. 前方捷报频传，令全军将士士气大振。

   qián​fāng Jié bào pín​chuán, lìng quán​jūn jiàng​shì shì​qì dà zhèn.

   Frequent news of victory from the front greatly boosted the morale of the entire army.

   Source: Dong Chinese Dictionary

3. 球队连输几场后，士气表现得非常低迷。

   qiú​duì lián shū jǐ cháng hòu, shì​qì biǎo​xiàn de fēi​cháng dī​mí.

   After the team lost several games in a row, their morale was very low.

   Source: Dong Chinese Dictionary

4. 这个好消息大大地振作了大家的士气。

   zhè gè hǎo xiāo​xi dà​dà de zhèn​zuò le dà​jiā de shì​qì.

   This good news greatly boosted everyone's morale.

   Source: Dong Chinese Dictionary

5. 将军的讲话大大鼓舞了战士们的士气。

   jiāng​jūn de jiǎng​huà dà​dà gǔ​wǔ le zhàn​shì men de shì​qì.

   The general's speech greatly boosted the soldiers' morale.

   Source: Dong Chinese Dictionary

6. 由于主帅亲自率兵在城头防守，守城士兵们的士气都很高。

   yóu​yú zhǔ​shuài qīn​zì shuài bīng zài chéng​tóu fáng​shǒu, shǒu​chéng shì​bīng men de shì​qì dōu hěn gāo.

   Since the commander-in-chief personally led the troops to defend the city walls, the soldiers' morale was very high.

   Source: Dong Chinese Dictionary