These bacteria are symbiotic with their human hosts—drawing sustenance from them, but also giving something in return by performing chemical transformations that human cells cannot manage and safely occupying ecological niches that might otherwise be colo
These bacteria are symbiotic with their human hosts—drawing sustenance from them, but also giving something in return by performing chemical transformations that human cells cannot manage and safely occupying ecological niches that might otherwise be colo
这些细菌与它们的人类宿主处于一种共生的关系——尽管像那个宿主那里获取营养物质，但反过来能帮助人体实现身体细胞不能做到的化学反应或是防止病原菌侵入人体而保持生态上的平衡。