1. a joint of a finger when the fist is closed

1. press or rub with the knuckles

2. shoot a marble while keeping one's knuckles on the ground

1.指节；指关节
Yourknuckles are the rounded pieces of bone that form lumps on your hands where your fingers join your hands, and where your fingers bend.

e.g. Brenda's knuckles were white as she gripped the arms of the chair.
布伦达握紧椅子扶手时指关节都变白了。

相关词组：knuckle downknuckle under

1. knuckle在线翻译

1. 指关节：折手指和打响指是男孩子们喜欢干的事. 先要说清楚,这不是很礼貌的举动. '折手指'就是knuckle cracking,因为折手指就是把手指关节 (knuckle) 弄得喀喀作响. 在Friends里,Joey曾经说过

2. 转向节：转向节(knuckle)是汽车的重要安全零部件,全世界的行业人士都极其重视其安全特性. 转向节的加工分为毛坯制造和成品机加工,毛坯制造既可以采用锻件形式,也可以采用铸造形式,杆部、法兰盘和叉部等部分则采用成品机加工. 该零件在原始设计中,