1. The main preventative agent is simply water. 主要的防护剂就是水。
2. They cover preventative care for the local resident. 他们为当地居民提供预防保健服务。
3. All information used in the development of national preventative policies would become generally available. 制定国家预防政策所使用的所有信息将普遍可用。
4. As a preventative measure, we are told to let in fresh air by opening the windows and not to use the air conditioners. 作为一项预防措施,我们被告知要打开窗户让新鲜空气进来,而不要使用空调。