📚 Day5 知识讲解

基数词变化规则表

1-12 特殊记 13-19 + teen 20-90 整十+ ty 其它
1 one 13 thirteen 20 twenty 一百
2 two 14 fourteen 30 thirty hundred
3 three 15 fifteen 40 forty 一千
4 four 16 sixteen 50 fifty thousand
5 five 17 seventeen 60 sixty 百万
6 six 18 eighteen 70 seventy million
7 seven 19 nineteen 80 eighty 十亿
8 eight     90 ninety billion
9 nine 21-99（非整十）：
十位与个位之间加“-”		 三位数：
在百位与十位或个位之间加“and”
10 ten
11 eleven 21 twenty-one 108 one hundred and eight
12 twelve 35 thirty-five 225 two hundred and twenty-five
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