从右开始，第一个“，”前的数字后添加 thousand，第二个“，”前面的数字后添加 million，第三个“，”前的数字后添加 billion 。然后一节一节分别表示，两个逗号之间最大的数为百位数形式 。
6. 英语的单词怎么写 基数词： one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty
序数词：first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelveth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentieth
7. 1到30 的英语单词怎么写 1 one
11 eleven
21
twenty-one
2 two
12 twelve
22 twenty-two
3 three
13 thirteen
23 twenty-three
4 four
14 fourteen
24 twenty-four
5 five
15 fifteen
25 twenty-five
6 six
16 sixteen
26 twenty-six
7 seven
17 seventeen
27 twenty-seven
8 eight
18 eighteen
28 twenty-eight
9 nine
19 nineteen
29 twenty-nine
10 ten
20 twenty
30 thirty
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