n.（指人）指关节；（指动物）膝关节，肘；铰结，肘形接；铜指节套vt.用指关节打、压、碰、擦； 变形： 复数：knuckles过去式：knuckled过去分词：knuckled现在分词：knuckling第三人称单数：knuckles 英英释义： knuckle[ 'nʌkl ]n.a joint of a finger when the fist is closed同义词：knuckle jointmetacarpophalangeal jointv.press or rub with the knuc