介绍:
20 twenty
30 thirty
40 forty
50 fifty
60 sixty
70 seventy
80 eighty
90 ninety
91 ninety-one
100 a hundred
101 one hundred and one
239 two hundred and thirty-nine
999 nine hundred and ninety-nine
1000 a thousand
备注：
100可以说 a hundred 或者one hundred
1000同理
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