Millions of receptors in the nose 's smelling organ aren 't scattered at random , a new study says .
一项新的研究表明，鼻腔内数以百万计的嗅觉受体并不是随机分布的。
What they are smelling is propionic acid , a substance that several species of gut bacteria produce in quantity .
肾脏闻到的是丙酸，这种物质是由几种肠道细菌大量产生的。
It seems the responses triggered while anticipating low-calorie foods -- seeing , smelling , tasting them -- still jumpstart the same metabolic processes needed to digest high-fat foods .
我们看到、闻到或品尝低热量食品时的反应，能引发消化高热量食品的新陈代谢过程。
The hormone testosterone is going down and the hormone prolactin is going up in the male brain , because he is smelling the pheromones of his pregnant wife .
