The explanation for insensitivity to smell seems to be that brain finds it inefficient to keep all smell receptors working all the time but can trigger new receptors if necessary.

• 对气味不敏感的解释似乎是这样的：大脑觉得无法让所有气味接受器始终有效地运作，但是，如果有需要的话，大脑可以创造新的接受器。