Zài shēngsǐ cúnwáng de guāntóu, dàjiā tuánjié yīzhì.
At the critical moment of life and death, everyone stood united.
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usage
存亡 is a literary and formal word used for high-stakes situations involving nations, civilizations, or causes — not used for individuals in ordinary speech. Common phrases: 生死存亡 (life and death; survival), 存亡攸关 (a matter of survival).