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。
He has cracked a bone in his arm.
他的手臂有一处骨裂。
His collar bone only hurt when he lifted his arm.
他的锁骨只是在举起手臂时才感觉疼痛。
The humerus is the long bone of the arm.
肱骨是上臂的长骨。
She has cracked a bone in her arm.
她手臂有一处骨裂。
She has cracked a bone in her arm.
她手臂有一处骨裂。
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