6 sentences

1. 这里的昼夜温差很大。

   zhè​lǐ de zhòu​yè wēn​chā hěn dà.

   The temperature difference between day and night here is very large.

   Source: Dong Chinese Dictionary

2. 工厂里机器的轰鸣声昼夜不停。

   gōng​chǎng lǐ jī​qì de hōng​míng shēng zhòu​yè bù​tíng.

   The roar of the machinery in the factory never stopped, day or night.

   Source: Dong Chinese Dictionary

3. 救援人员昼夜不停地搜寻幸存者。

   jiù​yuán rén​yuán zhòu​yè bù​tíng de sōu​xún xìng​cún​zhě.

   Rescuers searched for survivors day and night without stopping.

   Source: Dong Chinese Dictionary

4. 大雨昼夜不息地下着，庄稼都淹了。

   dà​yǔ zhòu​yè bù xī de xià zhe, zhuāng​jia dōu yān le.

   The heavy rain fell incessantly day and night, flooding the crops.

   Source: Dong Chinese Dictionary

5. 全体员工正为完成任务而昼夜奋战。

   quán​tǐ yuán​gōng zhèng wèi wán​chéng rèn​wu ér zhòu​yè fèn​zhàn.

   All staff are working hard day and night to complete the task.

   Source: Dong Chinese Dictionary

6. 在古代，人们将一昼夜划分为十二个时分。

   zài gǔ​dài, rén​men jiāng yī zhòu​yè huà​fēn wéi shí'èr gè shí​fēn.

   In ancient times, people divided a full day into twelve periods.

   Source: Dong Chinese Dictionary