umbone

例句：

1. 1. The old man was lying on the ground with his umbones exposed.
   那位老人躺在地上，他的骨头暴露了出来。
2. 2. The doctor examined the patient's umbones and found no fractures.
   医生检查了病人的骨头，没有发现骨折。
3. 3. The animal was found with its umbones broken in half.
   这只动物被发现时，它的骨头被打断了一半。