另一个理论认为发达的头骨是用来对付像兔子、驯鹿、狐狸和马这样难嚼的食物的。

Another theory is that developed skulls are used to treat difficult foods like rabbits, reindeer, foxes, and horses.

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墨西哥印第安人过去常用番木瓜树叶把难嚼的肉包起来。

Mexican Indians used to wrap tough meat in leaves from the papaya tree.

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