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为什么狗能闻到人类无法察觉的气味？

狗拥有更发达的嗅觉系统，其鼻孔、嗅觉神经和嗅觉中枢皮层都比人类更大。狗的嗅觉细胞数量多于人类的几倍，而且嗅觉神经信号处理速度快。狗的嗅觉系统还拥有特殊的结构，如涡状鼻腔和嗅觉滞留区，可以帮助狗更好地捕捉和解读气味。

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