knuckle /ˈnʌkl/ n.［c］ 指节，关节：Her thin hands were twisted by swollen knuckles.她那双纤手因肿大的指关节而变了形。He rubbed his hands together, cracking his knuckles as he tried to control his anger.他搓着双手，把指关节弄得噼啪作响，竭力控制住怒火。