形容詞 life-and-death:

1. vitally important
   同義詞：life-or-death

life-and-death

adj.（形容詞）
Involving or ending in life or death:
生死攸關(guān)的：涉及生死的或以生死終結(jié)的：
例句：
a mongoose in a life-and-death battle with a cobra.
與眼鏡蛇進行生死攸關(guān)搏斗的獴

Vitally important:
至關(guān)重要的：
例句：
a life-and-death struggle between union and management.
工會與資方的至關(guān)重要的斗爭