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.

• 对气味的不敏感似乎可以这样解释，大脑发现让所有的气味接受器一直工作效率会很低，但可以在需要的时候触发新的感受器。