XuanWhat really makes the Covid-19 to become a deadly pandemicOn March 11, 2020, the World Health Organization declared that COVID-19 was a global pandemic, indicating the significant global spread of…Jun 20, 2021Jun 20, 2021
XuanCovid 19：A Truth or a LieHumans have been known as the most intelligent creature in the universe. However, in 2020, when the Covid-19 starts to break down, the…Jun 15, 2021Jun 15, 2021
