由于鼻腔复杂的结构及嗅觉区特殊的生理位置，为直接的嗅觉研究带来了不少困难。
However, the complex nasal structure and special olfactory cortex position prevent the researchers from studying olfaction directly.
由于鼻腔复杂的结构及嗅觉区特殊的生理位置，为直接的嗅觉研究带来了不少困难。
However, the complex nasal structure and special olfactory cortex position prevent the researchers from studying olfaction directly.
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