英语数字读法：
1.从右至左,每3位数字加一个逗号,即下标法,而每一个逗号从右至左,则分别读作thousand千,million百万,billion十亿,trillion亿兆
2.逗号中间的数字则按照平常数字来读取,例如：123,456,789读作one hundred and twenty three million four hundred and fifty six thousand seven hundred and eighty nine
3.如果逗号中间的百位数或者百位和十位上面是零,则读作and,
如5,043,001读作：five million and forty three thousand and one
5,403,110 读作five million four hundred and three thousand one hundred and ten
你的问题：274,520则读作：two hundred and seventy four thousand five hundred and twenty
希望能为你解惑