code: public Nature getNature()
      {
          Nature nature = Nature.nz;
          switch (nPOS)
          {
              case CharType.CT_CHINESE:
                  break;
              case CharType.CT_NUM:
              case CharType.CT_INDEX:
              case CharType.CT_CNUM:
                  nature = Nature.m;
                  sWord = Predefine.TAG_NUMBER;
                  break;
              case CharType.CT_DELIMITER:
                  nature = Nature.w;
                  break;
              case CharType.CT_LETTER:
                  nature = Nature.nx;
                  sWord = Predefine.TAG_CLUSTER;
                  break;
              case CharType.CT_SINGLE://12021-2129-3121
                  if (Predefine.PATTERN_FLOAT_NUMBER.matcher(sWord).matches())//匹配浮点数
                  {
                      nature = Nature.m;
                      sWord = Predefine.TAG_NUMBER;
                  } else
                  {
                      nature = Nature.nx;
                      sWord = Predefine.TAG_CLUSTER;
                  }
                  break;
              default:
                  break;
          }
          return nature;
      }
docs: 原子的词性
  @return