1. Vaccines help protect against infectious diseases such as measles and influenza.
疫苗有助于预防麻疹和流感等传染病。

2. It is important to follow the recommended schedule for receiving vaccines.
接种疫苗时，遵循推荐的接种时间表很重要。

3. Some people may experience mild side effects after receiving certain vaccines.
接种某些疫苗后，有些人可能会出现轻微的副作用。

4. Vaccines have greatly reduced the incidence of certain diseases worldwide.
疫苗大大减少了全球某些疾病的发生率。

5. The development of new vaccines is a critical part of public health efforts.
新疫苗的研发是公共卫生工作的关键部分。

6. It is recommended that travelers receive certain vaccines before visiting certain countries.
建议游客在前往某些国家之前接种某些疫苗。