In the ambulance, DC suddenly flatlines.

在救护车里，DC突然没了心跳。

If he were, she could just throw him in bed and ride him right up until he flatlines.

要是他快死了 她就可以把他扔在床上 骑在他身上疯狂 直到他没气为止。

A patient is on the table in the emergency room, bleeding from a stab wound or having ODed on drugs, when suddenly, an alarm goes off and the beep beep beep on the heart monitor flatlines.

一个病人躺在急诊室的桌子上，刺伤流血或吸毒过量，突然，警报响起，心脏监视器上的哔哔声消失了。