1
prophylactic + noun
形容词直接修饰名词，表示预防某疾病或问题。
The doctor recommended a prophylactic vaccine.
医生推荐了一种预防性疫苗。
预防性的；防治的
先理解核心含义，再看它在真实句子里的用法。
预防性的；防治的
Serving to prevent or protect against an undesired effect, especially disease or pregnancy.
The doctor recommended a prophylactic vaccine.
医生推荐了一种预防性疫苗。
用于预防或保护免受不良影响,尤其是疾病或怀孕。
Serving to prevent or protect against an undesired effect, especially disease or pregnancy.
能防止受孕或妊娠的
capable of preventing conception or impregnation
The doctor prescribed a prophylactic treatment to prevent infection.
医生开了预防性治疗以防止感染。
Washing hands regularly is a simple prophylactic measure against colds.
经常洗手是预防感冒的简单措施。
They carried out prophylactic maintenance on the old bridge to avoid collapse.
他们对旧桥进行了预防性维护，以避免坍塌。
形容词直接修饰名词，表示预防某疾病或问题。
The doctor recommended a prophylactic vaccine.
医生推荐了一种预防性疫苗。
与against搭配，表示预防具体对象。
Regular handwashing is prophylactic against many infections.
勤洗手对许多感染有预防作用。
常见搭配，指预防性措施或治疗。
Antibiotics were given as a prophylactic measure after surgery.
手术后给予抗生素作为预防措施。
Not this
You should prophylactic against the disease.
Use this
You should take prophylactic measures against the disease.
误将形容词 'prophylactic' 用作动词。正确用法是将其作为形容词修饰名词，如 'prophylactic measures'。
Not this
He is very prophylactic, so he rarely gets sick.
Use this
He takes prophylactic measures, so he rarely gets sick.
形容词 'prophylactic' 通常不用于描述人，而是修饰动作或措施。应改为 'take prophylactic measures' 或类似结构。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
预防性治疗
The doctor recommended prophylactic treatment to prevent the infection from spreading.
医生建议采取预防性治疗以防止感染扩散。
预防性抗生素
Prophylactic antibiotics are often given before dental surgery.
牙科手术前常服用预防性抗生素。
预防措施
The government introduced prophylactic measures to stop the outbreak.
政府采取了预防措施以阻止疫情暴发。
预防性乳房切除术
She decided to undergo a prophylactic mastectomy after genetic testing.
基因检测后，她决定接受预防性乳房切除术。
Use prophylactic naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 prophylactic 中的 lactic（乳酸）：乳酸菌可预防疾病，故意为'预防性'。
语域：formal 常见场景：医学语境、正式写作 prophylactic 通常用于正式或医学书面语，口语中更常见 preventive/preventative。选择时需注意语境正式程度。
常用于名词前作定语或系动词后作表语。
Dictionary facts from ECDICT, WIKTIONARY.