4 sentences

1. 由于管理得当，这里的交通十分通畅。

   yóu​yú guǎn​lǐ dé​dàng, zhè​lǐ de jiāo​tōng shí​fēn tōng​chàng.

   Thanks to proper management, traffic here flows smoothly.

   Source: Dong Chinese Dictionary

2. 保持血脉通畅对身体健康至关重要。

   bǎo​chí xuè​mài tōng​chàng duì shēn​tǐ jiàn​kāng zhì​guān​zhòng​yào.

   Keeping blood circulation smooth is vital for health.

   Source: Dong Chinese Dictionary

3. 为了保持河道通畅，水利部门每年都要浚河。

   wèi​le bǎo​chí hé​dào tōng​chàng, shuǐ​lì bù​mén měi nián dōu yào jùn​hé.

   To keep the river channels clear, the water conservancy department dredges them every year.

   Source: Dong Chinese Dictionary

4. 这篇文章语句通畅，逻辑清晰。

   zhè piān wén​zhāng yǔ​jù tōng​chàng, luó​ji qīng​xī.

   The writing in this article is smooth and the logic is clear.

   Source: Dong Chinese Dictionary