If you describe something as crucial, you mean it is extremely important.
He had administrators under him but made the crucial decisions himself.
尽管他手下有许多官员,但重要的决定还是他自己做。
the most crucial election campaign for years.
几年来最重要的竞选活动。
Improved consumer confidence is crucial to an economic recovery.
消费者信心的提高对经济复苏至关重要。