3 sentences

1. 我婉言谢绝了他们的邀请。

   wǒ wǎn​yán xiè​jué le tā​men de yāo​qǐng.

   I politely refused their invitation.

   Source: AI Challenger 2017

2. 他邀我跳舞时我婉言拒绝了。

   tā yāo wǒ tiào wǔ shí wǒ wǎn​yán jù​jué le.

   When he asked me to dance, I declined politely.

   Source: AI Challenger 2017

3. 当你需要纠正他的时候，要说得委婉和具说服力。

   dāng nǐ xū​yào jiū​zhèng tā de shí​hou, yào shuō de wěi​wǎn hé jù shuō​fú​lì.

   When you need to correct him, be tactful and persuasive.

   Source: CCMatrix