And any given odorant, like this pizza, is made up of hundreds of different chemicals that you can smell, like the thymol of the oregano, the butyric acid of the cheese, and the acetylpyrazine of the crust.

任何特定的气味，比如这个披萨，是由你能闻到的数百种不同的化学物质组成的，比如牛至的百里香酚，奶酪的丁酸，和外皮的乙酰吡嗪。