方法:把数字写全,三位一个逗号,
百十个 billion + 百十个 million + 百十个 thousand + 百十个
9,370,000 nine million three hundred and seventy thousand
288,000,000 two hundred and eighty-eight million
17,080,000 seventeen million and eighty thousand
145,500,000 one hundred and forty-five million,five hundred thousand
550,000 five hundred and fifty thousand
61,700,000 sixty one million seven hundred thousand