6 sentences

1. 在紧要关头，他保持了冷静。

   zài jǐn​yào guān​tóu, tā bǎo​chí le lěng​jìng.

   He stayed calm at the critical moment.

   Source: Dong Chinese Dictionary

2. 他在最后关头送给对手一个大火锅。

   tā zài zuì​hòu guān​tóu sòng​gěi duì​shǒu yī gè dà huǒ​guō.

   He gave his opponent a big block at the last second.

   Source: Dong Chinese Dictionary

3. 还没到最后关头，我不甘心就这样失败。

   hái méi dào zuì​hòu guān​tóu, wǒ bù gān​xīn jiù zhè​yàng shī​bài.

   It's not over yet; I'm not resigned to failing like this.

   Source: Dong Chinese Dictionary

4. 在这个生死的关头，我们必须保持冷静。

   zài zhè​gè shēng​sǐ de guān​tóu, wǒ​men bì​xū bǎo​chí lěng​jìng.

   At this life-and-death moment, we must remain calm.

   Source: Dong Chinese Dictionary

5. 他在最后关头顶住压力，拿下了这场比赛。

   tā zài zuì​hòu guān​tóu dǐng​zhù yā​lì, ná​xià le zhè chǎng bǐ​sài.

   He withstood the pressure at the last moment and won the game.

   Source: Dong Chinese Dictionary

6. 在重要的历史性关头，我们必须做出正确的决定。

   zài zhòng​yào de lì​shǐ​xìng guān​tóu, wǒ​men bì​xū zuò​chū zhèng​què de jué​dìng.

   At a critical historical juncture, we must make the right decision.

   Source: Dong Chinese Dictionary