01首先要会念0到10的数字。zero，one,two,three,four,five,six,seven,eight,nine,ten.
02要掌握整十的数的表达。twenty,thirty,forty,fifty,sixty,seventy,eighty,ninty,one hundred.
03掌握百，千，万，十亿，万亿的表达。hundred,thousand,million,billion,trillion.
04十几的数的表达，除了十一eleven, 十二twelve,其余的数字几乎都是三到九的数加-teen：thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,ninteen.
05几十几的表达就是整十加上一到九的数。如21读着twenty-one,32读thirty-two,43读forty-three 等等。
06几百的数就是hundred 加and加尾数。123读one hundred and twenty-three.
07超过三位数的数字从右到左每三个数字用逗号分开，第一个逗号前的数字读thousand,第二个逗号前的数字读million,第三个前读billion,第四个前读trillion.如1,234,567,890读one billion,two hundred and twenty-four million,five hundred and sixty-seven thousand,eight hundred and ninty.
