- Vaccination immunizes people against smallpox .
- Suppose she wouldn t let herself be vaccinated again
- Vaccination immunizes people against smallpox
- Vaccination for smallpox is efficacious
- The government ordered that all sailors must be vaccinated before they went to sea , and the doctors of the royal navy were so pleased that there was no more smallpox in the ships that they gave jenner a gold medal
- His idea focused on taking the advanced points in western learning , popularizing the smallpox vaccination , swearing off opium , reinforcing civil rights and promoting social effect of newspapers in order to make our country rich arid powerful
老外自曝在中国如何赚钱 被租来撑场面 （双语）
调查： 读研更容易让人抑郁 （双语）