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  3. Of the well-known "five senses"--sight, hearing, smell, taste and touch--by far the most important to most animals is smell. But

Of the well-known "five senses"--sight, hearing, smell, taste and touch--by far the most important to most animals is smell. But

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问题    Of the well-known "five senses"--sight, hearing, smell, taste and touch--by far the most important to most animals is smell. But compared to other mammals, humans miss out. We have evolved to rely principally on sight and we are only gradually coming to understand what other animals can achieve by smell.
   In mammals, smells are detected by a thin layer of very sensitive cells in the nose called the olfactory epithelium (嗅觉上皮组织). Humans only have about five square centimeters of these cells, while an Alsatian dog, for example, has 150 square centimeters. This is why dogs continue to be used by man for everything from hunting wild animals to the search for hidden drugs.
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答案 众所周知动物有“五种官能”——视觉、听觉、嗅觉、味觉和触觉。对于大多数动物来说嗅觉是最重要的。然而人类与其他哺乳动物相比已相形见绌．我们已进化到主要依靠视觉，而且我们只是逐渐开始懂得其他动物使用嗅觉的作用。 在哺乳动物中，嗅觉是通过鼻腔内一种称为嗅觉上皮组织的极其灵敏的细胞薄层来察觉的。人类只拥有大约五平方厘米的这种细胞，而一只阿尔萨斯狼狗却有150平方厘米。这就是为什么人常常利用狗来做狩猎以至搜寻藏匿的毒品等事情．
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