either of two flat triangular bones one on each side of the shoulder in human beings
例句
用作名词 (n.)
The humerus is the long bone of the arm. 肱骨是上臂的长骨。
The antigravity shoulder muscles prepare to bring the arm to shelf level,and the hand is prepositioned and oriented to prepare forgrasp-ing. 当伸手动作展开时，前肋骨侧边的肌肉及上下颈部斜方肌会同时收缩使肩胛拉开向上，而旋转环膜会让肱骨呈外旋的姿势，并使得肱骨头置入关节窝。
美
