adj.预防疾病的
n.预防性药物(或器具、措施)

原形：prophylactic复数：prophylactics

The doctor prescribed a prophylactic antibiotic to prevent infection after surgery.
医生开了预防性抗生素以防止手术后感染。
She takes a daily birth control pill as a prophylactic measure against pregnancy.
她每天服用避孕药作为防止怀孕的预防措施。
The team's trainer applied an ice pack as a prophylactic for the athlete's knee injury.
教练团队对运动员的膝盖伤势使用冰袋作为预防性治疗。
A dental sealant is a type of prophylaxis used to protect children's teeth from decay.
牙齿封闭剂是一种用于保护儿童牙齿免受蛀牙的预防方法。
The government implemented strict quarantines as a prophylactic against the spread of the virus.
政府实施了严格的隔离措施，以防病毒传播。
He underwent a prophylactic mastectomy to reduce his risk of developing breast cancer.
他接受了预防性乳房切除术以降低患乳腺癌的风险。
After being bitten by a tick, she took prophylactic antibiotics to prevent Lyme disease.
被蜱虫咬伤后，她服用了预防性的抗生素来防止莱姆病。
The school provides annual flu shots as a prophylactic measure against influenza.
学校每年提供流感疫苗作为预防流感的措施。
The athlete wore compression socks during the flight as a prophylactic against deep vein thrombosis.
运动员在飞行中穿压缩袜，以防深静脉血栓形成。
In some countries, vaccination campaigns are conducted as a prophylactic against polio.
在某些国家，开展脊髓灰质炎疫苗接种运动是作为预防该疾病的一种手段。