Nonmedical use of antibiotics has therefore reinforced, albeit painfully, a simple lesson in microbial ecology: the environment selects the best adapt species.

• 虽然有这样惨痛的代价，抗生素的非医学用途仍在不断扩大推广，一个简单的在微生物生态学上的教训告诉我们大自然是优胜劣汰的。