存亡: live or die; survive or perish; survive and downfall 短语和例子生死存亡的斗争 a life-and-death struggle; 危急存亡之秋 at the critical juncture of life and death; 与阵地共存亡 defend one's position to the death
危急: critical; in imminent danger; in a desperate situation 短语和例子危急存亡之秋 at the moment of life and death; at the moment of crisis; 危急之秋 critical time; 伤势危急。 the wound may be fatal. 病人的生命在危急中。 th