手术后你咀嚼和吞咽都会感到困难。

After the operation you may find it difficult to chew and swallow.

《牛津词典》

但是，微笑和咀嚼对我来说都非常困难。

But it's hard to smile, and chew.

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这说明可能在困难时期来临而不易咀嚼食物是仅有的食物来源时，这个人种所具有的强壮下颚和牙齿便可以立刻派上用场。

This suggests that perhaps its robust jaws and teeth came in handy when times were difficult and hard-to-eat foods were the only things available.

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