医药科技的进步常常给我们带来福音。通过接种疫苗，我们已经可以预防诸如麻疹、乙肝、肺结核疾病了。那么，对于其它一些危害人类健康的疾病，如肺炎有没有好的办法来预防呢？肺炎是一种常见的疾病，老年人和体弱多病的儿童更容易感染肺炎，其典型症状就是发热、咳嗽、咳痰和 The advances in medical technology often bring us good news. By vaccination, we have been able to prevent such diseases as measles, hepatitis B and tuberculosis. So, for other diseases that endanger human health, such as pneumonia, there is no good way to prevent it? Pneumonia is a common disease, and older people and frail children are more susceptible to pneumonia. The typical symptoms are fever, cough, sputum and