当时生命垂危。用英语怎么说？

当时生命垂危。

Death was almost instantaneous.

death

n. 死亡，（某种）死法，死亡方式，病危，死神；

例句
The following year Parliament voted to abolish the death penalty for murder...
议会于翌年表决对谋杀罪废除死刑。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

almost

adv. 几乎，差不多，将近，快要，近乎；

例句
Despite considerable pain she has been getting out and about almost as normal...
尽管还很痛，她已经基本上行动如常。

instantaneous

adj. 瞬间的，即刻的，猝发的；

例句
Death was instantaneous because both bullets hit the heart.
因为两颗子弹都击中了心脏,所以死亡是瞬间发生的。