同義詞
1. the part of something that is central to its existence or character
- heart
- , nucleus
- , nub
- , hub
- , kernel
- , marrow
- , meat
- , essence
- , quintessence
- , crux
- , gist
- , pith
- , substance
- , sum and substance
- , body
- , basis
- , bedrock
- , cornerstone
- , linchpin
- , mainspring
- , foundation
- , root
- , base
- , underpinning
- , fundamentals
- , essentials
- , basic principles
- , main ingredients
- , heart of the matter
- , nitty-gritty
- , brass tacks
- , nuts and bolts
- , ABC
- , basics
2. the dense central region of a planet, especially the nickel–iron inner part of the earth
