疫苗与病毒的“外观”完全相同，主要由被削弱或杀死的病毒制成。

Vaccines are something that "looks" exactly the same as the viruses, mainly made from the viruses that are weakened or killed.

youdao

如果将硫柳汞完全从疫苗中去掉，则需要使用替代防腐剂，或完全使用不含防腐剂的单剂疫苗。

Removing thiomersal completely from vaccines would require either using alternative preservatives or using preservative-free single dose vaccines exclusively.

youdao

至于为什么疫苗会导致格林·巴利综合症，目前无人能完全说清楚，但不可否认的是，超过500人都患上了这一疾病，有25人甚至丢了性命(与此同时，猪流感却并未像人们所担心的那样大肆流行)。

No one is entirely sure why the vaccine caused guillain-barre syndrome, but it affected more than 500 people and killed about 25. (the feared swine flu epidemic never materialized that year.)

youdao

So, some of these cases were probably due to polio that was transmitted by incompletely killed virus that was present in the vaccine.

因此,那些病例的发病的原因,是被那些疫苗中携带的,没有被完全杀死的病毒感染

耶鲁公开课 - 生物医学工程探索课程节选

It turned out that one of--there were three vaccine manufacturers, one of them was using the procedure not quite correctly, they weren't completely killing the virus when they produced their vaccine.

结果显示,疫苗的生产厂家一共有三个,其中一家的生产程序不是非常正确,他们在生产疫苗的时候,并没有完全杀死病毒

耶鲁公开课 - 生物医学工程探索课程节选

So, totally avoids the manufacturing processes that are used to produce other vaccines; you got to manufacture DNA instead.

这完全避免了曾经用于,制造其它疫苗的那些生产过程,你只需要制造DNA就行了

耶鲁公开课 - 生物医学工程探索课程节选