- A joint or coupling that allows parts of a machine not in line with each other limited freedom of movement in any direction while transmitting rotary motion. Also called universal coupling 万向接头：一种接头或连轴节，能使互相不在一条线上的机械零件在传输旋转运动时在任意方向上具有有限的运动自由度 也作 universal coupling
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