2022年06月四级第1套选词填空原文翻译及答案解析

Questions __26__ to __35__ are based on the following passage.

以下相关问题基于以下文章。

You might think of your teeth as tools, like built-in knives and forks, but if they are mere tools, why do they feel pain and wouldn't it be better if they could just __26__ under any condition? In spite of our __27__ discomfort, it turns out there's a good reason our teeth are so sensitive. Tooth pain is a __28__ mechanism that ensures when a tooth is being damaged we'll notice and do something about it.

你可能把牙齿看作工具，比如内置的刀叉，但如果它们仅仅是工具，为什么它们会感到疼痛？如果它们能在任何条件下咀嚼，岂不是更好？尽管我们情感上感到不适，但事实证明牙齿如此敏感是有充分原因的。牙齿疼痛是一种防御机制，确保当牙齿受损时，我们会注意到并采取行动。

If we eat something too hot or too cold, or if the tooth is worn down enough where the tissue __29__ is exposed, all of those things cause pain, and then the pain causes the person not to use that tooth to try to protect it a little bit more. So it's really a protective mechanism more than anything else. If teeth didn't feel pain, we might __30__ to use them in situations that damage them, and for humans, damaging __31__ teeth is a problem because, unlike crocodiles, we can't __32__ them.

如果我们吃太热或太冷的东西，或者牙齿磨损到露出下面的组织，所有这些都会引起疼痛，然后疼痛使人不使用那颗牙齿，以试图更多地保护它。所以，这实际上是一种保护机制。如果牙齿不感到疼痛，我们可能会在损坏它们的情况下继续使用它们，对人类来说，损坏牙齿是个问题，因为与鳄鱼不同，我们不能替换它们。

Teeth have three layers, only one of which-the innermost layer of the tooth-can hurt, as that layer of the tooth __33__ both blood vessels and nerves. Pain is the only feeling to which the nerves in that layer respond. Whereas people with tooth sensitivity may complain, for example, of tooth pain __34__ by heat or cold, the nerves in the inner layer don't sense temperature. Rather, they feel pain, which may be __35__ with, say, drinking something very cold.

牙齿有三层，只有一层——牙齿最内层——能感到疼痛，因为这层牙齿包含血管和神经。疼痛是该层神经响应的唯一感觉。虽然牙齿敏感的人可能会抱怨，例如，由热或冷引起的牙痛，但内层的神经不感知温度。相反，它们感到疼痛，这可能与喝非常冷的东西有关。