Vaccines eradicated terrible diseases such as smallpox from the planet and succeeded in significantly reducing mortality due to other diseases such as measles, whooping cough, polio and many more.
疫苗彻底根除了 像天花那样可怕的疾病 也成功地大大降低了 其他像麻疹、 百日咳、小儿麻痹等疾病 所导致的死亡率