The human nose is not only the starting point of breathing, but also the smell. This is because there is an olfactory membrane in the mucous membrane of the nasal cavity, which is distributed with olfactory cells and can secrete liquid. When the odorous substance particles flow into the nasal cavity with the air, the nerves transmit the odor information to the olfactory center of the brain. After brain analysis and judgment, various smells can be distinguished. When we want to smell a certain smell, we always take a few short breaths after approaching it, as if doing so can help us better judge the accuracy of the smell. This is because the olfactory cells are concentrated in the upper end of the nasal cavity, and we inhale through the nostrils. The incoming air rarely reaches here, only rapid inhalation or swirling airflow can reach here. Therefore, when people identify smells, they always take a few deep breaths. The olfactory function of the nose is very important. For example, in the production of liquor, tea, and coffee, people largely rely on their sense of smell to judge the quality of products. But under normal circumstances, if a person is in the same smell environment for a long time, the person's nose will lose its feeling due to the "numbness" of the smell, and it will no longer be able to smell what the smell is. Therefore, there is a famous saying in my country called "Entrance" In a house of orchids, it’s been a long time without smelling its fragrance.”

Why do you "stop smelling its fragrance for a long time"?