Two muscles, the infraspinatus and teres minor, connect the shoulder blade to the upper arm bone and roll the arms outward.
冈下肌和小圆肌这两块肌肉，将肩胛骨和上臂连接起来，使手臂外旋。
The first find was a humerus, or upper arm bone, of a giant ground sloth.
第一个发现是巨型树懒的肱骨，或上臂骨。
The team found that two of the wing bones showed evidence of combat, including a fractured hand bone and a centimeter-thick upper arm bone that was broken in half.
研究小组发现的两个翅骨带有争斗留下的痕迹。其中一个是手骨，已经骨折，另一个是1厘米厚的上臂骨，已经断为两截。
Primate arms have one long bone, the humerus, in the upper arm above the elbow, and two thinner bones, the radius and ulna, in the forearm.
灵长类的上臂有一根长骨（肱骨），前臂有两根细骨（尺骨和桡骨）。
Primate arms have one long bone, the humerus, in the upper arm above the elbow, and two thinner bones, the radius and ulna, in the forearm.
灵长类的上臂有一根长骨（肱骨），前臂有两根细骨（尺骨和桡骨）。
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