而对于AD的早期诊断，则有望通过对内嗅区的新陈代谢和嗅觉变化的研究得以实现。
The research of metabolism of ER and olfaction changes can contribute to the early diagnosis of AD.
这主要是由于鼻腔的复杂结构及嗅区的特殊生理位置，为直接的嗅觉实验研究带来了不少困难。
The main reason is the complicated anatomic structure of the nasal cavity and the special physiological location of the olfactory region, which has caused much trouble in direct experiment studies.
多尔曼指出，例如大鼠鼻腔有一半的面积附有嗅细胞，而对于人类来说，这种嗅觉接收区就小得多，他说——“也就鼻腔的3% - 5%吧。”
For instance, Dorman notes that half of the nasal cavity of a rat is lined with olfactory-system cells. In humans, this receptive area is much smaller, he says - "only about 3 to 5 percent."
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