knuckles [ˈnʌklz]

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附加级

n.（指人）指关节( knuckle的名词复数 )；（指动物）膝关节，踝v.（指人）指关节( knuckle的第三人称单数 )；（指动物）膝关节，踝

He gripped the wheel until his knuckles whitened. 他紧紧握住方向盘，握得指关节都变白了。
Her thin hands were twisted by swollen knuckles. 她那双纤手因肿大的指关节而变了形。来自《简明英汉词典》