china_line_data         a data.frame which is the border map data of
                        China from http://nfgis.nsdi.gov.cn
china_map_data          a data.frame which is the detailed map data of
                        China from http://nfgis.nsdi.gov.cn
geneSEQ                 a string which is the sequence of 2019-nCoV
getDataFrame            Getting data.frame of detailed real-time
                        statistical numbers of every provinces of China
                        of 2019-nCoV virus cases
getMap                  Getting real-time monitoring map of the
                        2019-nCoV virus
getSeq                  Getting the gene sequence of 2019-nCoV virus
                        (i.e.GenBank:MN908947)
get_2019nCoV            Getting R2019-nCoV object and checking
                        real-time monitoring numbers of the 2019-nCoV
                        virus
