One test plot was experimentally burned each year, one was burned every three years, and one was left completely intact.

每年试验烧毁一块试验， 每三年烧毁一块，还有一块完无损。

So currently, the US Food and Drug Administration only allows doctors to use fecal transplants experimentally for battling one of the toughest gut infections — antibiotic-resistant Clostridiodes difficile.

目前，食品药品监督管理局（FDA）只允许医生试验过粪菌移植对付一种最严重的肠道感染疾病——耐抗生素梭状芽胞杆菌感染。