one hundred twenty seven
1.从前往后每三位数点一个逗号
2.从后往前的逗号依次读作:thousand,million,billion,trillion
3.从前往后依次读书字加thousand,million,billion即可
比如268531476203666这个数,先化逗号,成为268,531,476,203,666读作：（为方便清晰看分行写的）
two hundred and sixty-eight trillion
five hundred and thirty-one billion
four hundred and seventy-six million
two hundred and three thousand
six hundred and sixty-six
百位跟十位之间通常要加 and 连接,若十位是零则百位与各位之间也要加and