vital
/ˈvaɪtl; `vaɪtl/ adj
1 [attrib 作定语]
connected with or essential to life 与生命有关的; 维持生命所必需的
The heart performs a vital bodily function. 心脏起著维持生命的重要作用.
He was wounded in a vital part of his anatomy, eg the lungs, brain. 他身体的要害部分受了伤（如肺部、 大脑）.
(fig 比喻) The vital spark that would have brought the play to life was missing. 那出戏缺少的是可使之画龙点睛的生气.
2 ~ (to/for sth) essential to the existence, success, or operation of sth （对某事物的存在、 成功或运作）极重要的, 必不可少的
vital information, research, legislation 极其重要的信息、 研究、 法规
a vital clue to the killer's identity 有关杀人犯身分的重大线索
The police perform a vital role in our society. 警察在我们的社会中起著极其重要的作用.
It is absolutely vital that the matter is kept secret. 这件事要保密, 这是至关重要的.
3 (approv 褒) energetic or lively; dynamic 精力充沛的; 有活力的; 生气勃勃的
She's a very vital sort of person. 她是个精力旺盛的人.