5 sentences

1. 这些硬币不再流通了。

   zhè​xiē yìng​bì bù zài liú​tōng le.

   These coins are no longer in circulation .

   Source: OpenSubtitles

2. 这种旧钞现在已经不再流通了。

   zhè zhǒng jiù chāo xiàn​zài yǐ​jīng bù zài liú​tōng le.

   This old banknote is no longer in circulation.

   Source: Dong Chinese Dictionary

3. 屋子里的空气很不流通，憋得人难受。

   wū​zi lǐ de kōng​qì hěn bù liú​tōng, biē de rén nán​shòu.

   The air in the room isn't circulating well, making it feel stifling and uncomfortable.

   Source: Dong Chinese Dictionary

4. 这种旧纸币已经不再在市场上流通了。

   zhè zhǒng jiù zhǐ​bì yǐ​jīng bù zài zài shì​chǎng shàng liú​tōng le.

   This old banknote is no longer in circulation.

   Source: Dong Chinese Dictionary

5. 通过优化物流系统，我们可以加快商品的流通速度。

   tōng​guò yōu​huà wù​liú xì​tǒng, wǒ​men kě​yǐ jiā​kuài shāng​pǐn de liú​tōng sù​dù.

   By optimizing the logistics system, we can speed up the circulation of goods.

   Source: Dong Chinese Dictionary