isBIG5                  Indicate whether the encoding of input string
                        is BIG5.
isGB18030               Indicate whether the encoding of input string
                        is GBK.
isGB2312                Indicate whether the encoding of input string
                        is GB18030.
isGBK                   Indicate whether the encoding of input string
                        is GBK.
isUTF8                  Indicate whether the encoding of input string
                        is UTF-8.
ltp                     R Interface of LTP-cloud service
rLTP                    rLTP
toUTF8                  Convert encoding of Chinese string to UTF-8.
