4 sentences

1. 他勇于承认自己的错误。

   tā yǒng​yú chéng​rèn zì​jǐ de cuò​wù.

   He had the courage to admit his mistakes.

   Source: Dong Chinese Dictionary

2. 我们应该勇于尝试新事物。

   wǒ​men yīng​gāi yǒng​yú cháng​shì xīn shì​wù.

   We should have the courage to try new things.

   Source: Dong Chinese Dictionary

3. 勇于攀登科学高峰是科研人员必备的品质。

   yǒng​yú pān​dēng kē​xué gāo​fēng shì kē​yán rén​yuán bì​bèi de pǐn​zhì.

   The courage to scale scientific heights is an essential quality for researchers.

   Source: Dong Chinese Dictionary

4. 既然你已经知道错了，就要勇于改过，避免再犯。

   jì​rán nǐ yǐ​jīng zhī​dào cuò le, jiù yào yǒng​yú gǎi​guò, bì​miǎn zài fàn.

   Since you know you are wrong, you should have the courage to correct your ways and avoid making the same mistake again.

   Source: Dong Chinese Dictionary