5 sentences

1. 专家们正在研讨这个课题。

   zhuān​jiā men zhèng​zài yán​tǎo zhè​ge kè​tí.

   Experts are discussing this topic.

   Source: Dong Chinese Dictionary

2. 教授正在领导一个新的研究课题。

   jiào​shòu zhèng​zài lǐng​dǎo yī gè xīn de yán​jiū kè​tí.

   The professor is leading a new research project.

   Source: Dong Chinese Dictionary

3. 专家组正在对申报的科研课题进行选项。

   zhuān​jiā​zǔ zhèng​zài duì shēn​bào de kē​yán kè​tí jìn​xíng xuǎn​xiàng.

   The expert panel is selecting from the submitted research projects.

   Source: Dong Chinese Dictionary

4. 这个主课题下设三个子课题，由不同的小组负责完成。

   zhè​ge zhǔ kè​tí xià​shè sān gè zǐ kè​tí, yóu bù​tóng de xiǎo​zǔ fù​zé wán​chéng.

   This main project is divided into three sub-projects, which are being completed by different teams.

   Source: Dong Chinese Dictionary

5. 如何应对人口老龄化是当今社会的重大课题。

   rú​hé yìng​duì rén​kǒu lǎo​líng​huà shì dāng​jīn shè​huì de zhòng​dà kè​tí.

   How to deal with an aging population is a major issue in today's society.

   Source: Dong Chinese Dictionary