The dog sniffed at the bone, then went away.(那条狗闻了闻那块骨头，然后走开了。)
The dog was chewing on a bone.(那只狗在一个劲地啃骨头。)
The body is made up primarily of bone, muscle, and fat.(人体主要由骨、肌肉和脂肪组成。)
They can also be made of plastic, animal bone or metal.(它们也可以由塑料、动物骨头或金属制成。)
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 dogs were fighting over a bone.(那些狗为了一块骨头而争斗。)
The dog had buried its bone in the garden.(狗把骨头埋在花园里。)
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.(爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。)
There are 2,000 children worldwide who need a bone marrow transplant.(全世界有2000名需要骨髓移植的儿童。)
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