Medieval history is an important part of world history, and the study of world medieval history started late in Our country, and we must not forget the achievements of the scholars of our predecessors. Until after the reform and opening up, China......
middle ages World History history Europe Wu Yuyu
12-20
In the shadow of the rising infection rate of the new crown virus and the rapid spread of the mutated new crown virus "Omi Kerong", many European countries have recently begun to vaccinate children aged 5 to 11 years old against the new crown. According to...
COVID-19 vaccination child Europe Coronavirus infection Covid vaccine Mutated coronavirus
12-17