heartbeat
noun uk/ˈhɑːt.biːt/ us/ˈhɑːrt.biːt/
[ C or U ]心跳;心跳声
the regular movement or sound that the heart makes as it sends blood around your body
a steady heartbeat 平稳的心跳
the heartbeat of something [ S ] （某人或某事的）核心
the person or thing that is most important in forming the character of a place, organization, etc. and giving it energy
Keane was the heartbeat of the team. 基恩是球队的核心。
This ancient market is the heartbeat of our city.
People like teachers and firefighters are the heartbeat of their community.
The rhythm section is the heartbeat of the whole band.
He considers the car industry to be the heartbeat of America.
Idiom
in a heartbeatidiom 非常快的；无需考虑的
very quickly, without needing to think about it
I'd do it again in a heartbeat. 我无需考虑，还会这样做。