第三部分大意：

最后一个研发微生物相关的药物的方法是精确识别那些影响人的健康的微生物产生的物质，不论产生的是好的影响还是坏的影响。这和制药公司的兴趣相关。他们希望这些知识能够指向那些他们擅长的产品。然而，公众的注意力却转向了癌症领域。不过，肠道的菌群能够影响癌症的发展，这个想法既超乎寻常，又值得探寻。

The last microbiome-related approach to medicine is to identify exactly the microbe-produced substances which can affect human health, be it good or ill. This is related with the interests of pharmaceutical companies. They hope the knowledge can lead to the products which they are adept at making. However, the public has turned their effort to cancer. The idea that guts microbes can influence the progress of cancer is extraodinary and rewarding.