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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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今天的老年人是昨天的劳动者。他们对物质文化的发展作出了许多贡献，理所当然应享受物质文化发展的成果。若全社会都把尊敬老人看作当代的美德，人们就会有一种安全感。这使得各个年龄层的人都感到他们将来的日子肯定也是愉快的，就会全力以赴地投入工作。 去年，宣武医院公共卫生科通过五个居委会对天桥区老年居民做了一次调查。在这次调查的基础上总结出如何最大限度地满足老年人的需要。 在天桥区五个居委会的110 704个居民中，9.2%，也就是983人，是60岁以上的，受到采访的老人有967位，其中519位是妇女。
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