虽然一些猫咀嚼草或其它植物，但是生物学家认为这些粗纤维仅是用来助消化并且提供很有限的营养。
Some cats munch on grass or other plants, but most biologists agree that such roughage serves only as a digestive aid and provides limited if any nutritional value.
它们也失去了棕熊用来咀嚼植物性食物所用的臼齿。
They also lost the grinding molars that brown bears use to chew up plant matter.
你知道在你嘴里的你用来咀嚼的…
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