生死攸關

matter of life and death

to be born / to give birth / life / to grow / raw / uncooked / student

life or death

to die / impassable / uncrossable / inflexible / rigid / extremely / damned

distant, far / adverbial prefix

of great concern

mountain pass / to close; to shut; to turn off / to confine; to lock (sb) up; to shut (sb in a room, a bird in a cage etc) / to concern; to involve