1
preventive + noun
“preventive” 作定语，修饰名词。
Regular exercise is a preventive measure against heart disease.
定期锻炼是预防心脏病的一项预防措施。
预防性的；防止的
先理解核心含义，再看它在真实句子里的用法。
预防性的；防止的
Preventing, hindering, or acting as an obstacle to something.
Regular exercise is a preventive measure against heart disease.
定期锻炼是预防心脏病的一项预防措施。
预防的,阻止的,或作为障碍的
Preventing, hindering, or acting as an obstacle to.
为阻止军事侵略而进行的
Carried out to deter military aggression.
预防疾病发展的；预防性的
Slowing the development of an illness; prophylactic.
Taking vitamins is a good preventive measure against colds.
服用维生素是预防感冒的好方法。
The company implemented preventive maintenance to avoid equipment failures.
公司实施了预防性维护以避免设备故障。
Wearing sunscreen is a preventive step to reduce the risk of skin cancer.
涂抹防晒霜是降低皮肤癌风险的预防步骤。
“preventive” 作定语，修饰名词。
Regular exercise is a preventive measure against heart disease.
定期锻炼是预防心脏病的一项预防措施。
“be preventive of” 为较正式用法。
This vaccine is preventive of the flu.
这种疫苗可预防流感。
Not this
We need to take preventive.
Use this
We need to take preventive measures.
preventive 是形容词，不能单独作宾语，需要接名词如 measures。
Not this
This disease is preventive.
Use this
This disease is preventable.
preventive 意为'预防的'，而 preventable 意为'可预防的'。表示疾病可被预防应使用 preventable。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
预防措施
The government introduced preventive measures to stop the spread of the disease.
政府采取了预防措施以阻止疾病传播。
预防医学
Preventive medicine focuses on keeping people healthy rather than treating illness.
预防医学侧重于保持人们健康，而不是治疗疾病。
预防保健
Regular checkups are a form of preventive care.
定期体检是预防保健的一种形式。
预防性维护
Preventive maintenance can reduce the risk of machine failure.
预防性维护可以降低机器故障的风险。
先发制人的打击
The military launched a preventive strike against the enemy base.
军方对敌方基地发动了先发制人的打击。
预防性战争就像因为害怕死亡而自杀。
Regular exercise is a good preventive measure against heart disease.
经常锻炼是预防心脏病的好措施。
Use preventive naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想疫苗是 preventive medicine（预防医学），提前阻止疾病。prevent（阻止）+ ive 形容词后缀 = 预防性的。
语域：neutral 常见场景：healthcare、military、general prevention preventive 属于中性偏正式的用词，通常出现在医疗、军事或书面说明中；日常口语较少使用，但没有明显褒贬色彩。
常与against连用，表示‘预防…的’；也可后接名词构成复合形容词如preventive measure。
Dictionary facts from ECDICT, WIKTIONARY.