3 sentences

1. 我们要充分调动员工的积极性。

   wǒ​men yào chōng​fèn diào​dòng yuán​gōng de jī​jí​xìng.

   We should fully motivate our employees.

   Source: Dong Chinese Dictionary

2. 连续的失败严重挫折了他的积极性。

   lián​xù de shī​bài yán​zhòng cuò​zhé le tā de jī​jí​xìng.

   Successive failures have seriously dampened his enthusiasm.

   Source: Dong Chinese Dictionary

3. 这种奖励制度大大提高了员工的工作积极性。

   zhè zhǒng jiǎng​lì zhì​dù dà​dà tí​gāo le yuán​gōng de gōng​zuò jī​jí​xìng.

   This incentive system has greatly improved the employees' work motivation.

   Source: Dong Chinese Dictionary