n. anosmia
misc. have a bad nose (for) ; have a poor sense of smell
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看来，对嗅觉不灵敏的解释应该是：大脑发现让所有嗅觉感受器都始终工作的话效率太低，但是在必要时却能产生新的嗅觉感受器。
The explanation for insensitivity to smell seems to be that the brain finds it inefficient to keep all smell receptors working all the time but can create new receptors if necessary.
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