a stack of bones

例句：

1. 1.The old man was digging a hole to put his a stack of bones in.
   老人正在挖一个洞，准备把一堆骨头放进去。
2. 2.The dog was playing with its a stack of bones when it heard a noise.
   狗在玩它的一堆骨头时听到了声音。
3. 3.The children were playing with their a stack of bones as they walked home from school.
   孩子们放学后回家的路上，正和他们一堆骨头玩耍。