Vaccines are something that "looks" exactly the same as the viruses, mainly made from the viruses that are weakened or killed.
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。
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Thiomersal is a compound used to prevent bacterial and fungal growth in some inactivated (in which the virus has been killed) vaccines provided to countries in multi-dose vials.
Thiomersal is a compound containing ethyl mercury used to prevent bacterial and fungal growth in inactivated (in which the virus has been killed) vaccines presented in multi-dose vials.