狗的鼻孔大约有2亿左右的嗅觉细胞——比人多40倍。

Inside its nose are around two hundred million smell sensitive cells, forty times more than in humans.

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一个嗅觉细胞表达一种气味受体，人类约有350个气味受体基因。

A olfactory cell can express one odorant receptor. There are about 350 odorant receptor genes in human.

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例如，研究表明，即使是短暂的气味刺激也会导致嗅觉上皮细胞中受体短暂的减少，这个过程被称为“受体疲劳”。

For example, studies show that even brief periods of odorant stimulation produce transient reductions in receptors in the olfactory epithelium, a process termed "receptor fatigue".

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I think that in the next decade we will probably know how these cells actually work and the ear catches up to vision smell and taste in that regard.

我还相信，未来的十年中,我们也许能探明这些细胞的机理,赶上视觉，嗅觉和味觉,这些领域的研究。

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