a.

1. 生命的；维持生命所必需的[Z][B]
   Growth and decay are vital processes.

   生长和衰亡是生命过程。

2. 充满活力的，生气勃勃的
   The Chinese I knew were trusting, open, and vital.

   我所认识的中国人信赖别人，坦率，充满活力。

3. 极其重要的，必不可少的[（+to/for）]
   The questions put forward at the meeting are of vital importance.

   会上提出的那些问题极其重要。

4. 致命的；生死攸关的
   He committed a vital error.

   他犯了一个致命的错误。

n.[theP]

1. （人体的）重要器官
   He was lucky that the bullet missed the vitals.

   他很幸运，子弹没有击中要害器官。

2. 重要部分，要害

adj.

1. absolutely necessary; essential.
   ▸indispensable to the continuance of life:

   the vital organs.
2. full of energy; lively.
3. archaic fatal.

n.