This nerve travels from your neck down your upper arm, wrapping around the elbow joint on its way to the hand.
这条神经从你的颈部开始下伸到你的上臂，在运行到你的手的过程中围绕过你的肘关节。
2
The articulation of the radius and ulna in the arm is a pivot joint.
手臂桡骨和尺骨的连接关节是一个枢轴关节。
3
Using solid pipes or rods, at-joint, and a counterbalancing weight, you can assemble your own poor-man's copy -which can vary form the gimbal arm-and-vest variety to the side-handle version.