We are in a life and death situation. So, please do not understate the severity of the problem.我们正处于生死关头，所以，请不要低估问题的严重性。Many lives are at stake.许多人的生命处于生死关头。We're dealing with a life-and-death situation here.我们正面临一个生死关头。A doctor's job involves life and death situations.医生在工作中经常面临生死关头。It is do-or-die for the team.这是球队的生死关头。