This may be because some people do not have the genes necessary to generate 10 smell receptors in the nose.
这可能因为他们鼻子缺少一些基因，这些基因对于产生（10）专门的嗅觉感受器是必要的。
For one, it doesn't explain, why we can detect tens of thousands of odors with only a few hundred smell receptors.
其一，它没有解释，为什么我们能够依靠几百种的受体来感知数以万计的不同气味。
The brain finds it best to keep smell receptors 19 for unfamiliar and emergency signals 20 the smell of smoke, which might indicate the danger of fire.
大脑发现最好使嗅觉感受器(19)用于保持对不熟悉和紧急事件信号的敏感，(20)比如烟的气味，这可能表明了火灾的危险。
People vary greatly when it comes to smell, largely due to chance mutations in the genes that code for the smell receptors rather than for adaptive reasons.
说到嗅觉，各人大不相同，主要是由于嗅觉感受器的基因代码偶然发生变异，而不是由于适应。
The brain finds it best to keep smell receptors available for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.
大脑发现最好能让气味感受器对不熟悉或是紧急的信号保持敏感，例如烟的气味，其暗示可能有火灾的危险。
The explanation for insensitivity to smell seems to be that brain finds it 14 to keep all smell receptors working all the time but can 15 new receptors if necessary.
对气味不敏感的解释，好像是由于大脑发现保持全部嗅觉感受 器持续工作（14）效率不高，但如果必要的话可以（15）产生新的 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.
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。
Especially challenging are those that result from head injuries, whether minor or severe, that disrupt the function of the body's smell receptors - olfactory nerve cells that lie outside the brain.
尤其具有挑战性的是头部损伤，无论轻微还是严重，能够扰乱位于大脑外面的身体嗅觉感受器—嗅球神经细胞功能。
In mammals, neurons located in the nose detect scents using special odor receptors, and shuttle the information to the olfactory bulb, which is the integration center for smell.
在哺乳动物身上，位于鼻部的神经细胞运用特殊的气味感受器探测气味，并将信息传输给嗅球——嗅觉的整合中枢。
In mammals, neurons located in the nose detect scents using special odor receptors, and shuttle the information to the olfactory bulb, which is the integration center for smell.
在哺乳动物身上，位于鼻部的神经细胞运用特殊的气味感受器探测气味，并将信息传输给嗅球——嗅觉的整合中枢。
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