vital /ˈvaɪtl̟/ adjective Learner's definition of VITAL
1
[more vital; most vital] : extremely important : crucial必不可少的;极其重要的;关键性的 -
These matters are vital to national defense.这些事情对国防至关重要。
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He played a vital [=key] role in guiding the project.他在项目指导方面起了关键作用。
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The sciences are a vital part of the school curriculum.理科课程是学校课程必不可少的组成部分。
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It is vital that you follow all safety procedures. = It is of vital importance that you follow all safety procedures.遵守所有的安全规程极其重要。
2
always used before a noun : needed by your body in order to keep living维持生命所必需的 — see also vital signs 3
[more vital; most vital] : very lively or energetic充满生机的;生气勃勃的