The radius and ulna are the two bones which form the lower arm.

桡骨和尺骨是形成下臂的两块骨头。

The radius and ulna bones connect between the elbow joint and the wrist.

桡骨和尺骨连接在肘关节和腕关节之间。

But the underlying structures of the humerus, radius and ulna, and metacarpals, are shared.

但是肱骨、桡骨和尺骨以及掌骨的基础结构是共享的。

The shoulder girdle leads down to the humerus, radius and ulna and hands.

肩带向下延伸至肱骨、桡骨、尺骨和手。

It supports two bones on the forearm, the radius and ulna, which in turn attach to the wrists.

它支撑着前臂上的两块骨头，即桡骨和尺骨，它们又连接到手腕上。

All these motions use gliding, or plane joints, like the one between the distal ends of your radius and ulna, and the carpal bones of your wrist.

所有这些运动都使用滑动或平面关节，比如桡骨远端和尺骨之间的关节，还有手腕的腕骨。

The pivot joint between your radius and ulna allow you to rotate your palm forward or anteriorly in a motion called supination, and turning it backward or posteriorly is called pronation.

桡骨和尺骨之间的枢轴关节允许你在一个叫做旋后的动作中向前或向前旋转手掌，向后或向后旋转叫做内旋。