translation.en: Most of the pills that you can take or the yogurts that you can eat have one or two species in them, maybe five species in them, and the human community is thousands upon thousands of species.
translation.zh: 许多你可以吃的药丸或酸奶 含有一或两种，还可能五种细菌 而人体微生物群落包含数千个菌种