a preventative against
collocation预防……的药物或措施
Regular exercise can be a preventative against heart disease.
经常锻炼可以预防心脏病。
预防药
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预防药
remedy that prevents or slows the course of an illness or disease
The doctor prescribed a preventative to help lower her risk of heart disease.
医生开了一种预防药，帮助降低她患心脏病的风险。
预防药
remedy that prevents or slows the course of an illness or disease
障碍
any obstruction that impedes or is burdensome
避孕工具
an agent or device intended to prevent conception
Regular exercise is often called a good preventative against the common cold.
经常锻炼常被称为预防普通感冒的好方法。
Some people keep vitamin C pills as a preventative when traveling abroad.
有些人出国旅行时会把维生素C片作为预防药备着。
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预防……的药物或措施
Regular exercise can be a preventative against heart disease.
经常锻炼可以预防心脏病。
有效的预防药或预防措施
This vaccine is an effective preventative for the flu.
这种疫苗是预防流感的有效手段。
使用预防药；采取预防措施
Doctors recommend using a preventative if you travel to high-risk areas.
医生建议，如果你前往高风险地区，应使用预防药物。
作为预防措施
Some people take garlic as a preventative against colds.
有些人服用大蒜作为感冒的预防措施。
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联想 prevent（阻止、预防）：preventative 就是“用来预防/阻止的东西”，如预防药、避孕工具、障碍。
语域：neutral 常见场景：medical consultations、pharmacy labels、health articles 作为名词，preventative 多用于医疗或保健语境，可指预防药、障碍或避孕工具；具体含义视上下文而定。
以 -ative 结尾的 representative、tentative、conservative、laxative、affirmative 都与 preventative 的尾部拼写和读音 /ətɪv/ 相同，但重音位置不同，因此并不真正押韵。preventive 是容易看错的形近词：它没有 -ative 中的 /ə/ 音节，读作 /prɪˈvɛntɪv/。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.