牙齿不好就意味着消化不好，而消化不好就意味着营养吸收不好。
Poor teeth mean poor digestion and poor digestion means poor nutrition.
消化不良可能是因为嘴里的食物没有完全嚼碎而引起的。
Poor digestion can be caused by defective mastication of the food in the mouth.
他一直感到昏昏欲睡，因为吃了一顿异常量大而难以消化的饭、菜。
He had been feeling drowsy, the effect of an unusually heavy meal.
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