However, when the researchers grew each strain in cultures containing both doxycycline and a second antibiotic, ciprofloxacin, they found the opposite effect.

• 然而，当研究人员将两个菌群置于脱氧土霉素和另一种抗生素（环丙沙星）同时存在的环境中时，他们发现结果与头一种情况下的截然相反。