5 sentences

1. 这支钢笔的尖端非常圆滑。

   zhè zhī gāng​bǐ de jiān​duān fēi​cháng yuán​huá.

   The tip of this pen is very smooth.

   Source: Dong Chinese Dictionary

2. 鹅卵石被水流冲刷得十分圆滑。

   é​luǎn​shí bèi shuǐ​liú chōng​shuā de shí​fēn yuán​huá.

   The pebbles have been worn smooth by the flow of water.

   Source: Dong Chinese Dictionary

3. 他为人处世圆滑世故，深得老板的赏识。

   tā wéi​rén chǔ​shì yuán​huá shì​gu, shēn​dé lǎo​bǎn de shǎng​shí.

   He is sophisticated and worldly-wise in his conduct, which has earned him the boss's appreciation.

   Source: Dong Chinese Dictionary

4. 他为人处世非常圆滑，从不轻易得罪人。

   tā wéi​rén chǔ​shì fēi​cháng yuán​huá, cóng bù qīng​yì dé​zuì rén.

   He is very slippery in his dealings and never easily offends anyone.

   Source: Dong Chinese Dictionary

5. 他的回答非常圆滑，巧妙地避开了所有敏感问题。

   tā de huí​dá fēi​cháng yuán​huá, qiǎo​miào de bì​kāi le suǒ​yǒu mǐn​gǎn wèn​tí.

   His answer was very slick and skillfully avoided all sensitive questions.

   Source: Dong Chinese Dictionary