1. 铰链连接：Knoop scale||努氏硬度标度 | Knuckle joint||铰链连接 | Koplon||高湿模量粘胶纤维

2. 万向接头：knob 按钮;调节器 | knuckle joint 万向接头 | knurled nut 凸螺母

3. 铰链接合：knuckle gear 圆齿齿轮 | knuckle joint 铰链接合 | knurl wheel 滚花轮

4. 关节接合：18 主桅柱 king post | 19 关节接合 knuckle joint | 20 门柱形桅顶横桁 king bridge

noun

1. a joint allowing movement in one plane only

    Synonym: hinge joint

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

    Synonym: knucklemetacarpophalangeal joint