2 sentences

1. 生命垂危之际，他只剩下一息尚存。

   shēng​mìng chuí​wēi zhī​jì, tā zhǐ shèng​xià yī xī shàng​cún.

   On the brink of death, he had only a faint breath of life left.

   Source: Dong Chinese Dictionary

2. 由于伤势过重，这位病人的生命已经处于垂危状态。

   yóu​yú shāng​shì guò​zhòng, zhè wèi bìng​rén de shēng​mìng yǐ​jīng chǔ​yú chuí​wēi zhuàng​tài.

   Due to the severity of the injuries, the patient's life is in a critical state.

   Source: Dong Chinese Dictionary