six DOF六自由度sixnum.六six thousand four hundred and sixty three(=6463) 六千四百六十三six thousand seven hundred and eighty one(=6781) 六千七百八十一six thousand eight hundred and eighty one(=6881) 六千八百八十一six thousand four hundred and sixty seven(=6467) 六千四百六十七six thousand nine hundred and ninety nine(=6999) 六千九百九十九six thousand six hundred and seventy four(=6674) 六千六百七十四six thousand five hundred and ninety five(=6595) 六千五百九十五six thousand six hundred and seventy nine(=6679) 六千六百七十九six thousand eight hundred and sixty nine(=6869) 六千八百六十九six thousand four hundred and eighty five(=6485) 六千四百八十五