n.
the center of an object
"the ball has a titanium core"
a small group of indispensable persons or things
"five periodicals make up the core of their publishing program"
同义词：nucleuscore group
the central part of the Earth
the choicest or most essential or most vital part of some idea or experience
同义词：kernelsubstancecenteressencegistheartheart and soulinwardnessmarrowmeatnubpithsumnitty-gritty
a cylindrical sample of soil or rock obtained with a hollow drill
an organization founded by James Leonard Farmer in 1942 to work for racial equality
同义词：Congress of Racial Equality
the central meaning or theme of a speech or literary work
同义词：effectessenceburdengist
the chamber of a nuclear reactor containing the fissile material where the reaction takes place
a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
