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penicillin is used to treat [disease/infection]
penicillin 表示这种药物时通常作不可数名词，谓语动词用单数。
Penicillin is used to treat bacterial infections.
青霉素用于治疗细菌感染。
青霉素；盘尼西林
penicillins — plural of penicillin
先理解核心含义，再看它在真实句子里的用法。
青霉素；盘尼西林
an antibiotic obtained from Penicillium molds or made synthetically, used to treat infections
Penicillin is used to treat bacterial infections.
青霉素用于治疗细菌感染。
青霉素:一类窄谱抗生素,从青霉菌中提取或合成,具β-内酰胺结构,对革兰氏阳性菌有效,用于治疗各种感染和疾病。
Any of a group of narrow-spectrum antibiotics obtained from Penicillium molds or synthesized, that have a beta-lactam structure and are active against gram-positive bacteria and used in the treatment of various infections and diseases.
产生青霉素的青霉菌属霉菌。
A blue mold of the genus Penicillium that produces penicillin.
The doctor prescribed penicillin to treat her throat infection.
医生开了青霉素来治疗她的喉咙感染。
Tell your doctor if you are allergic to penicillin.
如果你对青霉素过敏，要告诉医生。
Penicillin is still widely used to fight bacterial infections today.
如今青霉素仍被广泛用于对抗细菌感染。
penicillin 表示这种药物时通常作不可数名词，谓语动词用单数。
Penicillin is used to treat bacterial infections.
青霉素用于治疗细菌感染。
常用动词有 take、prescribe、inject；penicillin 作不可数名词，前面不加 a/an。
You should take penicillin exactly as your doctor instructed.
你应该严格按照医生的嘱咐服用青霉素。
对……过敏用 be allergic to；penicillin 在这里也是不可数名词。
Tell your doctor if you are allergic to penicillin.
如果你对青霉素过敏，请告诉医生。
强调不同种类时可用复数 penicillins，但泛指这种药物时通常用单数。
Some penicillins are more effective against certain bacteria than others.
某些青霉素对特定细菌比其他青霉素更有效。
Not this
I need a penicillin.
Use this
I need penicillin.
青霉素泛指药物时是不可数名词，不能用不定冠词 a；只有表示种类时才可数，一般语境应直接用 penicillin。
Not this
You should eat penicillin three times a day.
Use this
You should take penicillin three times a day.
英语中服药用 take 而不用 eat，这是受汉语“吃药”直译影响造成的搭配错误。
Not this
I am allergic of penicillin.
Use this
I am allergic to penicillin.
形容词 allergic 后接介词 to，表示“对……过敏”，不能用 of。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
服用青霉素
The doctor told me to take penicillin for a week.
医生让我服用一周的青霉素。
一个疗程的青霉素
She finished a course of penicillin to clear the infection.
她完成了一个疗程的青霉素以消除感染。
青霉素过敏
Do you have a penicillin allergy?
你对青霉素过敏吗？
对青霉素耐药
Some bacteria are resistant to penicillin.
有些细菌对青霉素耐药。
发现青霉素
Alexander Fleming discovered penicillin in 1928.
亚历山大·弗莱明于1928年发现了青霉素。
我没有发明青霉素。那是大自然做到的。我只是偶然发现了它。
Alexander Fleming, the Scottish bacteriologist who discovered penicillin, said this humble line about what many consider one of the greatest medical breakthroughs of the 20th century.
苏格兰细菌学家亚历山大·弗莱明发现了青霉素，他用这句谦虚的话谈论许多人认为的20世纪最伟大的医学突破之一。
Use penicillins naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想想'盘尼西林'这个音译，再想想培养皿里的青霉菌——penicillin 就是青霉素。
语域：neutral 常见场景：医疗、日常交流 该词多用于医疗、药物说明以及日常谈论感染治疗时，语气较为中性；正式书面中通常写作“青霉素”，日常口语中有时沿用旧译“盘尼西林”。
与 penicillin 真正同韵的词有 amoxicillin 和 vanillin（重读元音及之后的 /ɪlɪn/ 相同）。Aspirin 和 insulin 拼写相似，但重音和元音不同，请勿按拼写类推读音。
Dictionary facts from ECDICT, WIKTIONARY.