n.
a long narrow opening
同义词：cleftcrevicefissurescissure
a narrow opening
"he opened the window a crack"
同义词：gap
a long narrow depression in a surface
同义词：crevicecrannyfissurechap
a sudden sharp noise
"the crack of a whip"; "he heard the cracking of the ice"
同义词：crackingsnap
a chance to do something
同义词：shot
witty remark
同义词：wisecracksallyquip
a blemish resulting from a break without complete separation of the parts
"there was a crack in the mirror"
a purified and potent form of cocaine that is smoked rather than snorted
同义词：tornado
a usually brief attempt
"he took a crack at it"
同义词：flinggopasswhirloffer
the act of cracking something
同义词：fracturecracking
