 We have developed a novel and comprehensive knowledge discovery framework, textbf COVID-KG to extract fine-grained multimedia knowledge elements (entities  , relations and events) from scientific literature.
<meaning-changed>  We have developed a novel and comprehensive knowledge discovery framework, textbf COVID-KG to extract fine-grained multimedia knowledge elements (entities  , relations and events) from scientific literature.
 We have developed a novel and comprehensive knowledge discovery framework, textbf COVID-KG to extract fine-grained multimedia knowledge elements (entities and their visual chemical structures, relations , relations and events) from scientific literature.