4 sentences

1. 网络联通非常顺畅，没有任何延迟。

   Wǎng​luò lián​tōng fēi​cháng shùn​chàng, méi​yǒu rèn​hé yán​chí.

   The network connection is very smooth, without any lag.

   Source: Dong Chinese Dictionary

2. 假期期间，高速公路上的交通非常顺畅。

   jià​qī qī​jiān, gāo​sù gōng​lù shàng de jiāo​tōng fēi​cháng shùn​chàng.

   During the holidays, the traffic on the highway was very smooth.

   Source: Dong Chinese Dictionary

3. 为了玩游戏更顺畅，他调高了电脑鼠标的灵敏度。

   wèi​le wán yóu​xì gèng shùn​chàng, tā tiáo​gāo le diàn​nǎo shǔ​biāo de líng​mǐn​dù.

   To make his gaming smoother, he turned up the sensitivity of his computer mouse.

   Source: Dong Chinese Dictionary

4. 他的英语口语表达非常顺畅。

   tā de Yīng​yǔ kǒu​yǔ biǎo​dá fēi​cháng shùn​chàng.

   His spoken English is very fluent.

   Source: Dong Chinese Dictionary