cowpox什么意思

cowpox的音标：cowpox的英式发音音标为：['kaʊpɒks]cowpox的美式发音音标为：['kaʊpɑks]...

The discovery of the cowpox vaccination let the danger of vaccination more less, and cost lest.牛痘术的发明使种痘的危险性更小, 花费也降到最低,故而很快在全世界推广开来.In nineteen century, Enligh doctor Pearson came to Macao to spread the cowpox vaccinati...