At ages 11 through 12, vaccines are recommended to protect against cancers caused by HPV, as well as to prevent tetanus, diphtheria, pertussis, and meningitis.

在11岁至12岁之间，建议注射由人乳头状瘤病毒（HPV）导致的癌症疫苗，同时也可防止破伤风、白喉、百日咳和脑膜炎。

The root problem is that today's parents are the first in history with no memory of the maiming and killing caused by polio, tetanus, diphtheria or measles.

根本问题在于，这一代父母们不知道脊髓灰质炎、破伤风、白喉、麻疹对人类的戕害，在历史上这是第一次。