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But no one's sure how well such studies model what happens in people, points out David Dorman of North Carolina State University in Raleigh.
但是没人能保证这项研究结论适用于人,位于罗利市的北卡罗莱纳州立大学的大卫·多尔曼指出。
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."