行政许可指行政机构根据公民、法人或其他组织的申请，经依法审查，准予其从事特定活动的行为。

i The difficulties of talking about smells
iiThe role of smell in personal relationships
iii Future studies into smell
ivThe relationship between the brain and the nose
v The interpretation of smells as a factor in defining groups
viWhy our sense of smell is not appreciated
vii Smell is our superior sense
viii The relationship between smell and feelings

In spite of its importance to our emotional and sensory lives, smell is probably the most undervalued sense in many cultures. The reason often given for the low regard in which smell is held is that, in comparison with its importance among animals, the human sense of smell is feeble and undeveloped.