It's really hard, but in essence, nerves from the brain go up into the nose and on these nerves exposed in the nose to the outside air are receptors, and odor molecules coming in on a sniff interact with these receptors, and if they bond, they send the nerve a signal which goes back into the brain.
这确实非常困难， 但在本质上， 大脑的神经延伸至鼻子 以及鼻子上类似传感器的 暴露在空气中的神经。 气味分子通过吸气 与传感器接触。 如果他们键合，他们给神经传递一个信号， 这个信号将到达大脑。