化学预防

例句：

1. 1. Chemical prevention is crucial in preventing the spread of disease.
   化学预防在防止疾病传播中至关重要。
2. 2. The government has implemented a chemical prevention plan to reduce pollution.
   政府已经实施了一个化学预防计划，以减少污染。
3. 3. During the outbreak, chemical prevention measures were put in place to prevent the virus from spreading.
   在疫情爆发期间，采取了化学预防措施以防止病毒传播。