3 sentences

1. 如果失败了，我们就重头再来。

   rú​guǒ shī​bài le, wǒ​men jiù chóng​tóu zài lái.

   If we fail, we'll just start over from scratch.

   Source: Dong Chinese Dictionary

2. 他是我们项目组里的重头人物。

   tā shì wǒ​men xiàng​mù​zǔ lǐ de zhòng​tóu rén​wù.

   He is a key figure in our project team.

   Source: Dong Chinese Dictionary

3. 这首词的上片和下片采用了重头的结构。

   zhè shǒu cí de shàng piàn hé xià piàn cǎi​yòng le chóng​tóu de jié​gòu.

   The first and second halves of this poem use a repetitive structure.

   Source: Dong Chinese Dictionary