中英释义：
双语例句
因为接种天花疫苗时，人体会接触到极少剂量的病毒,疫苗接种所引发的死亡远远低于天花自然传播。
Because smallpox inoculation exposed people to such a tiny dose of the virus, it caused far fewer deaths than the natural spread of the disease.
重点词汇
-
接种
vaccinate; inoculate; immunize
-
天花疫苗
anti-smallpox vaccine; glycerinated vaccine virus