penicillin BT

例句：

1. 1. Penicillin is an antibiotic that can treat many bacterial infections.
   青霉素是一种抗生素，可以治疗许多细菌感染。
2. 2.The doctor prescribed penicillin for my friend's infection.
   医生给我的朋友开了青霉素来治疗感染。
3. 3. Penicillin has saved countless lives due to its ability to fight antibiotic-resistant bacteria.
   由于其对抗抗药细菌的能力，青霉素挽救了无数生命。